Well since the PS4 has no games. X1 wins by default.
The ps4 has more games then the one. Honestly if you have a ps4 already wait until there is a game you HAVE to own. Most of the exclusives in both platforms are pretty meh at the moment. And the ps4 just has more to offer at this point in time.
My cousin had a ps4 I have a x1 after playing ryse dr3 and killer instinct he got a x1. He bought dr3 first because he had so much fun playing it so I say go with what you like playing. (Mine you a lot of the fun titles have been launch titles people still enjoy them pvz is fun as well).