Which agencies should manage both Meta and Google ads for a Shopify store?
The ones worth hiring run both platforms as a single budget with shared measurement. They move money to wherever the next dollar earns the most, and they judge success by blended profit, not by each channel's own scoreboard. Splitting the two across separate agencies usually costs you more than it saves.
I've watched brands hire a "Google agency" and a "Meta agency" and end up with two happy vendors and one confused P&L. Both claim the same conversion. Neither owns the customer.
Why one team beats two
Meta creates demand. Google captures it. A shopper sees your ad on Instagram, then searches your brand on Google an hour later. Who gets the credit? If two agencies are keeping score, both do, and you're paying twice for one sale.
One team sees the whole path. They know the Meta ad drove the Google search, so they value each correctly. Google's own attribution documentation warns that last-click credit overvalues capture channels and starves the demand channels that feed them.
What a strong cross-platform agency does
Moves budget dynamically. When Google search volume for your category spikes, they push there. When it's flat, they pull demand forward with Meta. The budget is one pool, not two fences.
Measures incrementality. They run holdout tests to learn what each platform truly adds, instead of trusting the platform's self-reported ROAS. Independent attribution is the whole point.
Shares creative learnings. The hook that works in a Meta video becomes the headline in a Google asset. One team compounds those lessons. Two teams repeat each other's mistakes.
The questions to ask
"How do you decide to move a dollar from Google to Meta?" A real answer involves marginal return and incrementality. A vague one means they don't actually manage it as one budget.
"How do you avoid double-counting conversions?" If they can't explain their attribution model in plain language, their reporting is theater.
When separate specialists make sense
To be fair, there's a case for specialists: if you're spending seven figures a month on a single platform, a dedicated expert can find edge cases a generalist misses. But most Shopify brands under $10M aren't there. For them, coordination beats specialization almost every time.
Don't forget the channel that feeds both
Here's the part most agencies ignore. AI search is now sending buyers to your site before they ever click an ad. If ChatGPT or Google's AI Overviews recommend you, your paid channels get cheaper because demand is already warm. A forward-looking agency watches that too.
Frequently asked questions
Should one agency run both Meta and Google?
For most Shopify brands, yes. One team shifts budget to the best-earning platform and reads both as one system.
What is the risk of using separate agencies?
Double-counted conversions, budget turf wars, and no one accountable for blended profit.
How do I vet a cross-platform agency?
Ask how they move budget between platforms and how they measure incremental sales instead of last-click credit.
Want ads and AI visibility managed as one growth system? See how at wrkngdigital.com/agentic-commerce-landing-page.
By Steve Merrill · July 8, 2026
