Unless something has changed recently, Fargate is a terrible choice for something that you want up 24x7. IIRC it’s like 2x the cost of similar on demand EC2 instances. It’s better for discrete tasks that can’t run in Lambda because timeout or possibly peak load (although EC2 is probably just as easy if not easier to scale).

But I generally agree with the premise that ECS is a better starting point for people just dipping their toe into containers.