[dragonwriter]

> Are there shows or movies on Hulu that I'm not getting from Netflix or Prime?

Yes, each has a different set of back-catalog shows, Hulu has current-season shows from a number of networks, and all three outlets of exclusive, first-party content.

They also overlap significantly, so whether the marginal value of adding Hulu is justified is a question you'll have to answer yourself, but there is definitely stuff you won't have with the other two that you would by adding Hulu.