Google Ads vs Facebook Ads for Shopify Stores
META TITLE: Google Ads vs Facebook Ads for Shopify Stores
META DESCRIPTION: Google ads vs Facebook ads for Shopify. Triple Whale medians put Google ROAS at 3.27 and Meta at 1.88, yet Meta still takes 66.88% of ad spend.
SLUG: google-ads-vs-facebook-ads
TAGS: Google ads vs Facebook ads, Meta ads, Shopify ads, ROAS, attribution, Performance Max
Google ads vs Facebook ads is not a tie, and for most stores it is not really a choice. Google Ads converts the traffic it sends. Facebook Ads reaches people who were not shopping yet.
In Triple Whale's ecommerce data for 1 August 2025 to 31 July 2026, Google Ads posted a median ROAS of 3.27. Meta's was 1.88. Meta still took 66.88% of ecommerce ad budget over the same window. The two platforms do different jobs, and the numbers below show where each one earns its place.
How Google Ads and Facebook Ads Target Customers
The difference sits in how each platform picks who sees your ad. Google Ads starts with a typed query. Google's own help documentation puts it plainly: "the keywords you choose need to match the words or phrases that people search for." Google describes Search campaigns as text ads that "let you reach people while they're searching on Google." The search is for "the products and services you offer."
For a store with a catalog, Google's Shopping campaigns are the obvious fit. Google calls them "product listings that are ideal if you're a retailer looking to sell your product inventory."
Google is no longer only a search channel. Performance Max is "a goal-based campaign type" reaching six named surfaces from one campaign. Those are YouTube, Display, Search, Discover, Gmail, and Maps. Shopping inventory joins them when a Merchant Center feed is attached.
Meta starts from the opposite end. Meta Ads Manager offers six campaign objectives: Awareness, Traffic, Engagement, Leads, App promotion, and Sales. Only one of the six is Sales, which Meta describes as finding "people likely to purchase your goods or services."
Shopify's own blog draws the line this way. Choose Google Ads "when customers are actively searching for what you sell." Choose Facebook Ads "to create demand and catch people's attention when they're not actively shopping."
Some readers still search Facebook ads vs Google adwords. AdWords is the former name of Google Ads, so it is the same comparison.
Google Ads or Facebook Ads for Ecommerce: The Benchmark Numbers
Triple Whale published medians for both platforms over one identical window, 1 August 2025 to 31 July 2026. Same publisher, same period. That is what makes the columns comparable.
Triple Whale medians, 1 August 2025 to 31 July 2026:
| Median Metric | Meta Ads | Google Ads |
|---|---|---|
| ROAS | 1.88 | 3.27 |
| Conversion Rate | 1.53% | 3.11% |
| CTR | 2.39% | 1.65% |
| CPM | $15.06 | $15.35 |
| MER | 0.48 | 0.28 |
These figures supersede the FY2025 numbers on our Shopify ad benchmarks page, which covers an earlier window.
One caveat belongs with that table. The Meta report covers over 40,000 brands, the Google report over 21,000. Same window and publisher, but not the same brand set. Both columns are medians as measured inside Triple Whale, not incremental results.
Read the MER row with care. Both benchmark reports publish MER as a figure below 1. That only makes sense as spend against revenue, the direction Triple Whale's product documentation uses. The Meta report's own text defines it the other way round, as total revenue divided by total ad spend. Our guide to what MER actually measures sets out both conventions.
Facebook Ads CTR vs Google Ads Conversion Rate
Look at CTR and conversion rate together. Meta's median CTR is 2.39% against Google's 1.65%. Then it flips. Google's median conversion rate is 3.11%, Meta's 1.53%.
Meta gets more people to click and fewer of them to buy. Triple Whale reads it the same way. Its report says the 2.39% CTR shows Meta's visual formats "continue to generate strong top-of-funnel engagement." The challenge, it adds, "lies in converting that interest into purchases." That pair of rows explains the ROAS gap.
Facebook Ads vs Google Ads on Cost per Thousand Impressions
Here is the finding that kills the usual framing. Reaching a thousand people costs about the same on both platforms. Meta's median CPM is $15.06 and Google's is $15.35. Facebook Ads is not the cheap channel any more.
Neither platform escaped auction inflation. Meta's CPM rose 13.24% year over year and Google's rose 13.34%. Meta's own results point the same way, reporting average price per ad up 12% year over year. More detail sits in what Facebook ads cost a Shopify store.
Google Ads vs. Facebook Ads: Ecommerce Ad Spend Share
Ecommerce brands do not split evenly. In Triple Whale's data, Meta took 66.88% of ad spend. Google Ads took 22.50%, second by a wide margin. Google's share dropped 2.63% over the year.
Efficiency moved the other way from what that spend split suggests. Google's ROAS fell 3.54% to 3.27 and its conversion rate fell 7.02%. Its AOV rose 4.31% to $87.65. Meta's ROAS was roughly flat, up 0.57% to 1.88.
Reach explains part of that split. Meta reported 3.60 billion daily active people on average for June 2026, up 3%. Search is not shrinking either. Alphabet's SEC-filed second-quarter results show Google Search and other advertising revenue of $63,271 million, up 17% year over year.
Google Ads vs Facebook Ads Incremental ROI (Marketing Mix Modelling)
Platform dashboards grade their own homework. Marketing mix modelling does not. Cassandra published median modelled ROI for both platforms. Google's median ROI is 4.37, across 114 clients and $630 million of ad spend.
Meta's median is 2.94, across 108 clients and $323 million. The wider study covers 1,221 revenue marketing mix models across 70 brands and 22 markets. It spans 83 channels and $1.85 billion in measured spend from 2020 to 2025.
Two caveats come with those figures. The ranges overlap. Cassandra publishes 90% bootstrap intervals of 2.26 to 3.99 for Meta and 3.30 to 5.21 for Google. The gap is real, but not absolute for every brand. Cassandra also states that "an ROI greater than 1 is desirable but does not necessarily equate to profit." It counts advertising cost only. Set your own floor with our break-even ROAS calculator.
The return is not uniform inside Google either. Our Google Ads for Shopify guide carries Cassandra's modelled ROI by campaign type, including where Performance Max lands.
Why Google Ads and Meta Ads Manager Report Different Conversions
The two platforms count conversions differently by design. Meta can credit a conversion to an ad that was only seen. Its documentation describes click-through attribution counting events "within 1-day or 7-day after a link click." View-through counts events "within 1-day after an impression of your ad."
Google Ads does the opposite by default. Its help pages state that view-through conversions "are not included in the 'Conversions' column, only in the 'View-through conversions' and 'All conversions' columns." Google also confirms that data-driven "is the default attribution model for most conversion actions."
Meta itself warns against mixing counting methods. Its documentation says comparing across different attribution models "will lead to inaccurate conclusions."
Meta now offers an alternative. Its incremental attribution model "optimizes delivery for incremental conversions," predicting whether an ad caused the conversion.
The practical rule: judge both channels against one blended number from your own store data. Our CAC calculator is a place to start.
Google Ads vs Facebook Ads: Which Is Faster to Set Up on Shopify
Meta is faster to get live. Shopify says the Facebook and Instagram by Meta channel is "free to use with all Shopify plans, subject to store eligibility." It also syncs your products to a catalog. Google gates you behind Merchant Center approval.
Google's Merchant Center documentation says that review can take up to 3 to 5 business days for Shopping ads. Our Google Ads for Shopify guide lists the full Merchant Center requirements.
Budget rules differ too:
| Platform | Published Budget Rule |
|---|---|
| Google Ads | Daily spending limit is 2× your average daily budget; monthly limit is 30.4× your averagXe daily budget |
| Meta | With the cost per result goal bid strategy, daily budget should be at least 5× your cost per result goal. A $5 goal requires at least $25 per day |
Performance Max vs Meta Advantage+: What Google and Meta Claim
Both vendors publish a headline number for their automated campaign type. Both are vendor claims.
| Vendor Claim | Figure | Footnote |
|---|---|---|
| Google on Performance Max | 27% more conversions or value at a similar CPA/ROAS | Measured against Search with broad match and Smart Bidding; Google Data, Global, Ads, October 2023 to November 2023 |
| Meta on Advantage+ sales campaigns | 9% improvement in cost per conversion | Stated as an average; no period published |
Note what neither claims. Google's is a volume claim held at a similar ROAS. Meta's is a cost-per-conversion claim. Neither is a like-for-like comparison. Our Meta Advantage+ guide unpacks that side.
How to Split Budget Between Google Ads and Facebook Ads
Allocation is a capacity question before it is a preference question.
Google Ads can only spend against searches that already happen. So the gate is your own non-brand query volume, not a percentage rule. Pull it from Search Console or Keyword Planner and split it against your branded terms.
If nearly all of your search demand is branded, Google's ceiling is low, because branded search is demand you already own. A large non-brand pool means Google can absorb far more budget before it starts bidding on people who were coming anyway.
Meta has no such ceiling. It no longer has a price advantage either. At $15.06 against $15.35, a thousand impressions costs roughly the same on either platform. Treat a Meta test as a full budget line, not a cheap one.
Our Google Ads for Shopify guide covers the mechanics of running both at once. Our guides on automating the Meta side and lowering Shopify CAC go deeper on each channel.
How Agency AI Manages Google Ads and Facebook Ads
Agency AI connects to both platforms from inside Shopify, and its home screen reports Meta, Google and Blended ROAS side by side. Its Shopify App Store listing names Shopify Admin, ChatGPT MCP, Claude MCP, Facebook Ads Manager, Google ads, Google ads manager and Meta.
The approval model is asymmetric. Google recommendation cards carry an Apply button that makes the change in Google Ads. Nothing on the Meta side moves automatically. Meta recommendation cards carry no Apply button.
A Meta change proposed in the AI Strategist chat sits as a pending action behind Decline and Approve. Agency AI's documentation is explicit: "Agency AI does not push optimization changes into Meta on your behalf." Every change requires you to act first.
The product also names the problem this article covers. Two of the AI Strategist's own starter prompts read "Why does my ROAS not match Meta Ads Manager?" and "Compare Meta vs Google last 30 days."
Pricing is one live plan, Essentials, at $59 per month or $492 per year, a 31% saving. There is a 30-day free trial. The Shopify App Store listing shows a 5.0 rating from 5 reviews.
Google Ads vs Facebook Ads: Which Should a Shopify Store Use
Treat this as a job allocation, not a contest. On Triple Whale's medians, Google Ads converts at roughly double Meta's rate. Meta reaches people who are not searching, at almost the same cost per thousand impressions.
The split follows your own catalog and your own query data. Measure how much non-brand search demand your category actually carries, set your break-even ROAS, then size each channel against both.
Frequently Asked Questions
Sources
Checked 25 August 2026 against primary pages. Keyword matching, the Search and Shopping campaign descriptions, the Performance Max definition with its six named surfaces, the 27% claim and its footnote, view-through conversion reporting, data-driven attribution and the daily and monthly spending limits all come from Google Ads Help. The six campaign objectives, the attribution windows, the warning against comparing attribution models, incremental attribution, the 9% Advantage+ figure and the minimum budget guidance come from Meta's own Business Help Center. Those Google and Meta figures are vendor claims about their own products and are labeled as such. The choice framing quote is from Shopify's blog post on the same comparison. The 3 to 5 business day product review and the free Facebook and Instagram channel come from the Shopify Help Center. All median benchmark figures, the spend split and the year-over-year movements come from Triple Whale's separate Facebook Ads and Google Ads benchmark reports, both covering 1 August 2025 to 31 July 2026, over 40,000 brands on Meta and over 21,000 on Google. Modelled ROI, the client counts and the confidence intervals come from Cassandra's 2026 media effectiveness benchmarks. Platform scale figures come from Meta's second-quarter 2026 investor release and Alphabet's SEC-filed second-quarter 2026 earnings exhibit. Agency AI pricing, rating and works-with list come from its live Shopify App Store listing, re-verified 25 August 2026. Product behavior comes from Agency AI's own knowledge base and captures of the shipped interface.
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