Most of the good games are on both systems. If you are going to play online, X-box has the edge. Sony is doing better in regards to improving their online experience, but the X-box is still more stable.
Right now, the PS4 has the edge on games running at 1080p. The Xbox One has been having problems with true 1080p. I just read that Microsoft is allowing developers to use another processor which was exclusively used for the Kinect, so in light of that, I'm sure the Xbox One will probably be able to output at 1080p as well.
Like Fishooked, I've had PS1-4. I also have a Xbox 360. I like both, but I tend to play Playstation more just because I have more friends on the Playstation.
IMO, both systems are pretty much the same. Look at what the exclusives are for the next year or two and see if either one of those draws your fancy. The one thing I'll say is Xbox usually has exclusives when it comes to downloadable content coming to their system first. You might want to take that into account before you buy.