I prefer my PS3. The Uncharted series is easily the best 2 console games ever made. No fee for internet, netflix, blue ray, I personally like the PS3 controller better. Having both, I borrowed a game from a friend for the Xbox, which I already had for the PS3, and saw no discernible difference in the visuals. The game was Just Cause 2, which is a very graphic rich game (and also super fucking fun), and couldn't really see a difference. If I could only have one, I would keep my PS3.
P.S. computer gaming trumps all.