XBone.
I want something that's more media centric anyway, so it has that on it's side. I also actually like the integration of the Kinect as well, so whilst many are seeing it as a negative, personally I see it as a positive. I've found over the past few years that the most popular 'party' consoles tend to be the Xbox first, then the Wii, both because the kinect/wiimote adds some fun into it. If I got a PS4, I'd end up buying a eye anyway, and the lack of integration of the Eye makes me concerned about how well developers will put the effort in.
Finally, I was reassured the other day that Forza > Gran Turismo now a days (given that if I want a full sim I have a PC and wheel upstairs, I want something more arcadey in that sense), and finally, Halo intrigues me as an exclusive over other things PS over. Other games that I'll be interested in, Madden 25, ESO - depends how mods work on PC, as I may go with that instead, GTA5, are likely to be available on both consoles.
kd