Relay has some nicer ergonomics when it comes to composing queries from fragments for different components, and the mutation behaviour is a bit more "magic", bu

Relay has some nicer ergonomics when it comes to composing queries from fragments for different components, and the mutation behaviour is a bit more "magic", but both of these benefits come with some serious restrictions on what you can do. The next version of Relay looks like it'll do away with this approach, bringing it closer in line with how Apollo does things right now. I'm a heavy user of Relay (been using it since it was first open-sourced around 18 months ago), but given that it's going to be changing quite a bit in the near future, I think newcomers to GraphQL are going to be better off with Apollo for now.