ECS Fargate. We used it for a lot of stateless containers, similar as you mention. I tried to migrate from ECS Fargate onto EKS, but moved back after a while. The reason was the "management" overhead of babysitting the cluster and it's non-app deployment like cilium, fluxcd etc. - Since those were part needed and part QoL features we came to the conclusion that ECS Fargate was the better and less 'head ache' solution. I would do it again. Especially not thinking about provision new nodes etc.

Sure you pay for that comfortable solution, but it was worth in my opinion

Go with ECS if you don’t need Helm and significant operational overhead. Having used both ECS and EKS for the past few years, I’ve found that ECS requires negligible maintenance.

BTW: Checkout ecs fargate too. if workload is small this will do the most.

If you don't need anything beyond the feature set of ECS and are happy to stick with AWS for the foreseeable future, then I'd advise you to listen to your gut - EKS is more complex, and needs a bit more looking after.

Personally, I'd disagree with your consultants on being able to avoid multiple AWS accounts as a selling point. When you need to isolate workloads or implement hard security boundaries, accounts are generally the simplest and most reliable way of doing that. Following the Well Architected Framework is a good standard practice and there are plenty of guides and examples to help you.

If things do change in the future, it's not actually that big a deal to deploy to EKS instead (or as well) - but for your needs, I think ECS would make a better starting point.

(And I agree with other posters that ECS Fargate is likely the best fit for you)

Don’t argue with the consultants.

It is not a hill worth dying on.

And you don’t know the big picture, but the little picture is everyone agreed the consultants were the right way to decide before you were there; arguing implies the people who sign contracts and write the checks are wrong; and business decisions are about the whole business and engineering exists to support the business - not to optimize itself.

To put it simply, the decision has been made by people with more experience in your organization’s culture, more authority, and a better understanding of the business as a whole.

Plus your here on HN because you have not convinced the stakeholders.

Good luck.

Have done both and I'd say ECS wins almost always, as long as you can be in AWS. If you are true unicorn/hyperscale, Kube will start to pay off. But otherwise, the upgrade treadmill of kube and the blank stare of SWE's who don't want to learn helm charts, argo, ingress controllers etc are not worth dealing with when you can just ship ECS and have it work for years with minimal overhead.

startups/small-medium businesses implementing Kube are doing it for cargo cult reasons or stealth career development/employment security initiatives by the relevant devops or sre teams.

ECS fargate is a must as well because no "server" means a ton less compliance burden.