I’ve lost count of the number of budget meetings I’ve sat in where someone asks whether the next quarter’s spend should go into Google Ads or into SEO, as if the two are interchangeable line items solving the same problem.
They’re not, and the businesses that treat them as identical are usually the ones stuck paying more for the same traffic year after year with nothing to show for it once the campaign stops.
I’m Myles, Director at Essheo. I spent years managing PPC budgets alongside SEO strategies for a business that scaled past £65 million in turnover, so this isn’t a theoretical comparison for me, it’s one I’ve had to get right with real money on the line.
In this post I want to break down exactly how Shopify SEO and Google Ads perform against each other over the long term, using the actual cost, conversion, and ROI data available, so you can make this decision with proper evidence rather than a gut feeling.
How Do the Fundamentals of Each Channel Differ?
Before comparing numbers, it’s worth being clear on what you’re actually buying with each channel, because the mechanics explain almost everything about why the long term results diverge so sharply.
What You’re Paying For With Google Ads
Google Ads is an auction. Every click you get, you pay for again next time, at whatever price the auction sets that day. The average cost per click for e-commerce Google Ads sits around £0.95 to £1.16 depending on category, and a well optimised Shopify store running Google Shopping campaigns can typically expect a 4x to 6x return on ad spend when everything is dialled in correctly.
That’s a genuinely solid return, but it resets to zero the moment you pause the spend.
What You’re Building With SEO
SEO is closer to infrastructure. You’re not paying per click, you’re paying to build and maintain assets, optimised product pages, collection pages, technical fixes, content and backlinks, that keep earning clicks without ongoing per click cost. The trade off is time. SEO doesn’t deliver instant traffic the way switching on a Google Ads campaign does, but what it builds tends to stay built.
What Does the ROI Data Actually Show Over Time?
This is where the comparison gets genuinely interesting, because the gap between the two channels widens dramatically the longer you measure.
Cost Per Acquisition Over a 12 Month Period
After twelve months of consistent Shopify SEO work, cost per acquisition from organic traffic typically drops to somewhere between £24 and £64. After twelve months of paid ads, cost per acquisition is often the same as it was in month one, sometimes higher, because you’re still paying for every single click at whatever the auction demands that day.
SEO’s cost curve bends downward with time and consistent effort. Google Ads’ cost curve, for most competitive Shopify categories, stays flat or climbs.
Why Does SEO’s ROI Curve Improve While Ads Stay Flat?
Understanding the shape of each curve matters more than any single number, because it tells you what to expect at month three versus month eighteen.
The Compounding Nature of Organic Assets
Every optimised collection page, every piece of content that earns backlinks, every technical fix that improves crawlability, these things don’t just deliver a one off result. They stack. A collection page ranking on page one this quarter tends to rank more securely next quarter as it accumulates more engagement signals and internal link equity, and that stability tends to spread authority to the pages around it too.
This is why SEO adoption among online store owners has grown from around 30% in 2022 to 85% by 2025, business owners are increasingly recognising it as the more sustainable route rather than a nice to have.
The Reset Problem With Paid Media
Google Ads doesn’t compound in the same way. Your quality score can improve slightly over time, nudging your cost per click down marginally, but the fundamental economics of the auction don’t change in your favour just because you’ve spent money there before.
Pause the campaign for a month and your visibility disappears completely. There’s no equivalent to a ranked page sitting quietly in the index, still generating traffic, months after the work was done.
What Role Does AI Search Play in This Comparison Now?
This is the variable that’s changed the calculation most significantly over the past year, and it’s one that neither channel handled this way even eighteen months ago.
AI Overviews Are Reshaping Where Clicks Go
AI Overviews now appear in a substantial share of Google searches, with some tracking putting the figure between roughly a quarter and half of queries depending on category and measurement window.
Organic click through rate on queries triggering an AI Overview has fallen noticeably as a result, but sources cited within those AI Overviews are seeing their own click share rise, and this citation opportunity is something Google Ads simply cannot buy.
There’s no ad unit inside an AI Overview summary. If you want visibility there, it has to be earned through content structured well enough to be quoted.
Why This Matters for Long-Term Channel Strategy
This is a big part of why we built Essheo around Search Everywhere Optimisation rather than treating Google as the only battleground. Structured content, clear FAQ formatting, and comprehensive Product and FAQ schema all increase the odds of being cited by AI tools, and that visibility compounds in exactly the way traditional organic rankings do.
Google Ads is a channel confined to Google’s paid results. SEO, done properly in 2026, extends into AI platforms, YouTube, and the forums that large language models pull answers from. That’s a structurally larger opportunity, and it’s one that only grows the longer you invest in it.
When Should You Still Use Google Ads Alongside SEO?
I want to be fair here, because dismissing Google Ads entirely would be as misleading as dismissing SEO. Each channel has a job it does better than the other.
Google Ads Wins on Immediate Revenue Needs
If you’ve just launched a new product and need sales this week, or you’re testing demand in a new market before committing to a full content strategy, Google Ads is the faster lever every time.
Meta Ads typically deliver a similar 3x to 5x return for direct to consumer brands with strong creative, and both channels can generate meaningful revenue within days of launch. We support clients with paid media for exactly this reason, as a supporting channel, never the primary strategy.
SEO Wins on Sustainable, Long-Term Growth
But if the question is which channel builds a defensible position that doesn’t evaporate the moment the budget gets cut, the data consistently points to SEO. Rising ad costs mean your Google Ads ROI is unlikely to improve on its own over time, whilst a properly executed SEO strategy tends to become more efficient the longer it runs.
For a marketing manager building a case for next year’s budget, that’s the difference between renting your traffic indefinitely and actually owning an asset that keeps performing.
Ready to Find Out What Your Long-Term ROI Could Look Like?
We built Essheo around exactly this kind of long term thinking, structured 12 and 18 month roadmaps designed to reduce dependency on paid channels whilst building organic visibility that compounds across Google, AI platforms, and beyond.
Our clients have generated over £45 million in combined revenue over the last two years through the systems we’ve designed, and every senior practitioner on our team brings 8+ years of experience ranking against genuinely tough competition, including household names like MoneySuperMarket, GoCompare, and uSwitch.
If you’re a marketing manager or decision maker trying to work out whether your next pound is better spent on Google Ads or on SEO, I’d rather walk you through the specific numbers for your store than give you a generic answer.
Book your Shopify SEO strategy call with Essheo today, and let’s build a growth channel that keeps paying you back long after the campaign ends.