PC ;)
But seriously if I was going to splurge on one of them it would be the PS4. The XBone's selling points (if you can call them that) are already available in smart tvs. I reckon most core gamers will be eying up the PS4 at this point too: cheaper, more powerful and more specialised as a games console.
Although the 'share' feature of the PS4 just seems like an empty gimmick, Microsoft seem to be actively trying to alienate as much of their potential player base as possible. Quite odd actually.