Most ecommerce platform comparisons are written for the person building the shop, not the person who has to make it sell. They compare monthly fees, theme libraries, payment gateways and app stores, and they are usually thorough about all of it. Growth Bully, a Malta performance marketing agency, keeps meeting the consequence a year later: a shop that works perfectly and cannot be advertised profitably.
The platform is an acquisition decision disguised as a technical one. Four of its capabilities set your cost per sale before you write a single ad.
Does your ecommerce platform really affect ad performance?
Yes, through three mechanisms. It decides how reliably purchase data reaches the ad platforms, which is what bidding optimises against. It decides whether your catalogue can be advertised as a feed rather than as individual ads. And it decides how fast the checkout is, which changes how many paid clicks become orders.
None of that appears on a feature comparison. All three show up in your cost per acquisition within the first month of spending money.
What should you actually test before choosing a platform?
Four capabilities, in this order, because each one affects more money than the one after it. Ask for a demonstration rather than a yes, since every platform claims all four and the differences only appear when you look at what the data actually contains.
- Server side purchase tracking. Can it send completed orders to the ad platforms from the server, including order value and currency, not only from the browser. Browser only tracking loses orders, and the losses are silent.
- A complete product feed. Can it output every field shopping campaigns need, kept current automatically when stock and prices change. Partial feeds mean disapproved products, which means your bestsellers quietly stop being advertised.
- Checkout speed on a mobile connection. Not the homepage score, the checkout, tested on a real phone. This is where paid traffic either converts or leaves.
- Data ownership and export. Can you leave with your customers, orders and product data in a usable format. If the answer is a support ticket, you do not own it.
Why does the product feed matter more than the storefront?
Because the feed is what shopping and catalogue campaigns actually advertise. Your storefront design influences conversion rate, but the feed decides which products appear at all, how they are titled, and whether the price and stock a shopper sees matches reality. A broken feed removes products from the auction entirely.
Feed quality is also the cheapest performance work available in ecommerce. Titles that match how people search, correct categories, stock accuracy and sensible product grouping routinely move results more than new creative does, and none of it is possible if the platform cannot export the fields in the first place.
What happens to tracking under consent rules?
A share of your visitors will decline tracking, so browser based measurement will always undercount. Platforms that can send server side events keep reporting conversions you are legally entitled to count, while platforms that cannot leave bidding algorithms optimising against a fraction of your real sales.
That gap compounds. Underreported conversions make campaigns look unprofitable, which triggers budget cuts to campaigns that were working. The rules themselves are not the problem, the measurement setup is, and the detail of doing it properly sits in consent and tracking in the EU.
How much does checkout speed change what you pay per sale?
Enough to decide whether a campaign is viable. Paid traffic arrives with less patience than organic traffic, usually on mobile, often mid task. Every extra step and every slow page between the ad and the confirmation screen raises the cost of the orders you do get, because you paid for all the clicks either way.
Test it the way a customer meets it. Open an ad on a phone, add to basket, and buy something. Count the steps, the forms, and the seconds. Most platforms are fine here by default and get slow because of what was installed on top of them, which is worth knowing before blaming the platform.
What do you actually lose when you migrate platforms?
More than the build cost, and most of what breaks is marketing infrastructure rather than code. Plan a migration as a measurement project with a shop attached, not the reverse, because the five things below tend to belong to nobody until the week after launch.
- Conversion history, which automated bidding depends on. Expect a relearning period and budget for it.
- URL structure, unless every old product and category URL redirects to its match.
- Feed identifiers, which usually change and can disconnect your historical shopping performance.
- Tracking, which has to be rebuilt and verified on the new checkout rather than assumed.
- Reviews and customer data, which move only if the old platform lets them.
Decide the sequence before the launch date. Redirects and tracking verified on a staging site cost a day. Discovered after launch, they cost a quarter.
Who should own the platform decision?
Whoever is accountable for cost per sale, with the developer advising rather than deciding. Web teams optimise for build quality and maintainability, which are legitimate goals, but nobody in that conversation is usually measured on acquisition cost. Someone in the room has to be.
In practice that means asking one question before the shortlist is drawn up: what does this platform make easy or impossible for the people who have to sell through it. The answer changes the shortlist more than any feature table, and it is the same thinking that decides whether ecommerce ad returns are achievable at all, whether your numbers will reconcile across platforms, and how much of your revenue can come from owned channels rather than paid ones. The tracking rebuild itself is covered in conversion tracking that survives, and it is the first thing we check on any paid social account we take over.
If you are choosing a platform now, or already on one and wondering why the ads will not scale, the answer is usually in the data it sends rather than the ads themselves. Send us your shop and your ad account together and you will get a straight read on which one is capping the other.