When the two systems came out, I was stuck buying a PS4, when I really wanted a XBox One. I have now traded my PS4 for a XBox One...
Forza 5 is slightly more fun than any PS4 game I have played. Although, I never got to play Infamous for PS4 either. Also, Killer Instinct Xbox One is an exceptional game, that will keep your hands numb much like the old days of button-smashing such as on the SNES.
The rumble feature of the XBox One controller is sophisticated. It just feels slightly different than 360's or even PS4's controller rumble. I bought the $500 XBox One with Kinect which has a free Forza 5 game download with it.
I am happy. I feel like I like the XBox One slightly better than the PS4. The only thing I can stress when buying a console, is go by the facts, but also go by your gut feeling. My gut feeling is that I would like XBox One slightly better than PS4, and I wasn't disappointed.