I'm going with PS4 because I haven't a clue about the Xbox, aha.
I got the PS due to the exclusives at the time but I think my colleague said the Game Pass for Xbox was pretty good and you tend to get deals and such (I know PS has one as well but I've not really used it).
I like both, but mostly xbox just because my friends all have xbox mostly.
PS3 had to be my favorite only because it was free to play online games without a membership.
If I had to choose between Xbox or Playstation, it would have to be Xbox because that's where my highest levels are in ESO. But I don't want to get involved in that game again.