PS4 all the way.
It's more powerful, it's $100 cheaper, and it has games that appeal to me more. We can't forget the fact that Microsoft was trying to fuck over consumers with 24 hour check-ins, a restricted game trading service and a lot of the features they're touting are locked behind the Xbox Live Gold paywall.
I've been primarily a 360 gamer this gen, but the way Microsoft seems to be cutting support for the 360, just like they did for the OG Xbox, is unsettling. The only big exclusive they released this year is Gears of War: Judgment, and I couldn't even be bothered to play it, despite being a huge Gears fan. Halo 3 is awesome, and ODST is great and extremely underrated, but Halo started falling off, in my opinion, with Reach. The campaign is great, but the MP kinda sucked. Reach also ruined Firefight, which is awesome in ODST. Halo 4's campaign wasn't that memorable for me. It looked great, but it was kinda boring.
Being a single player gamer primarily, I feel like I enjoyed Sony's exclusives more and The Last of Us coming so late in the console cycle shows that Sony supports its consoles a lot longer than MS does.