PS4 is what it is, it plays games, and your able to watch Netflix, Stan and a number of other apps for more streaming services, however it is what it is, it is big and not exactly the size of the Apple TV, as a user of both, the experience counteracts, Apple TV with the remote and phone app, PS4, controllers and app all the same, it all depends on what you prefer, the Apple TV is small, and the PlayStation isn't and usually sits in the living room.
It all depends on what you prefer, I wouldn't buy a PS4 if I wasn't to use it, neither an Apple TV for the same reason, but both can live in peace, would be nice to have a streaming app for PS4 streaming to Apple TV, but that's never going to happen