X.
Xerneas is one majestic motherfucker, while Yveltal is edgy.
Clauncher is way better than that meth seahorse.
Swirlix is cute as fuck, and Spritzee will never be a plague doctor so it's worthless.
Anyway version exclusives don't really matter anymore since now you can search on the GTS even for pokes you haven't seen yet so... I would wait and hope that they'll reveal other differences, things like White Forest and Black City, to really make a decision.
