We started using Amazon EC2 Container Service 3 years ago because it was the easiest containers orchestration tool to start with. At the time it was missing a lot of features compared to other tools, but it was still the fastest way to deploy a container on AWS. As with any AWS product, over time they caught up and improved it significantly. Today it probably one of the best tools in its category. It might not have all the feature Kubernetes has, but it also has less complexity. And it definitely has all the features a small company/team needs.