I think the PS3 tops the Xbox360, I am no "fanboy" because I have played and owned both, although there are more players on the Xbox360, I have yet to go to a server that isn't clan based with mature players, however for the Ps3 you get the people who every so often decide to talk, but a more mature audience due to the fact that the Console doesn't come with the headset for the annoying children who occasionally play the Xbox360 to enjoy.
Anyways, if you are more interested in gun games, I recommend the Ps3, however, if your an all around styled gamer(This means, sports, racing, fps,etc) I recommend the Xbox360 due to hit games like Fable 2 and other games for Xbox360 only.
But GeneralSkar, if I were to get a Xbox360 for as you said games like skate, why not buy a ps3 and still own a computer, you get Skate and most Xbox360 games.