I have a ps3 and Xbox 360. They are both pretty similar as to what they offer imo. Normally I would say to choose one based on the exclusive content you like more. That might not be the case for you. So a few things to consider.
PlayStation network is free. XBOX live is about 50/yr. Ps3 is also a bluray player. Xbox 360 is not. Xbox has kinect which might give you some of the things you want from the wii like kinect sports.
Another thing to think about is that this generation of consoles may be near it's end. It's definitely beyond the midway point for their lifespan.