Playstation is the better platform as it has a superior graphics and smoother gaming experience. Playstation games are also more innovative and often are cheaper to buy and easier to find then many titles created for Xbox. The features of the Playstation platform are more user friendly and less buggy then what Xbox has to offer.
I have used PlayStation since the first one, and now I'm up to number four. While the graphics have been a consistent improvement with each new generation, I am afraid that the Xbox simply does all those things better. Also I feel that the Xbox offers a consistent and appealing graphical user interface that supports more apps. Also, the voice and gesture control features offered by Kinect just can't be beat.