I don't have experience with any of them.
Netflix has the larger selection and the better original content.
Hulu is good for recent episodes of new TV shows.
Don't use Amazon since it doesn't have an Apple TV app...
I never used them. But i heard more than a thousand compliments about Netflix.
Netflix. While Amazon video has a few good things on it, Netflix just has so vast an array of content that Amazon video is just incomparable. Despite this, I personally have Amazon due to the other benefits that come with Amazon Prime.