Docker on AWS - what is a difference between Elastic Beanstalk and ECS?

I want to migrate from Heroku to Amazon AWS and I would like to deploy my app in Docker image. So the app consists of:

• Web server (node.js -> docker image)
• Worker (node.js -> docker image)
• Postgres database (Amazon RDS)
• Redis instance (Amazon ElatiCache?)

With my app I (Web+Worker):

• I have to be able to scale both web and worker instances manually or auto.
• update with new image with zero-downtime
• see realtime/history metrics
• see realtime/history logs

And now when studying Amazon docs I found "Elastic Beanstalk" and "Amazon EC2 Container Services (ECS)". I was wondering which one should I use to manage my application (docker images)? What is a difference between them?