My friend said there isn't much difference between the PS3 and 360, and the 360 is $200 cheaper or so isn't it? Currently the 360 has more games because it's half a year old, not sure if it can play the regular xbox games but I think it can.
Games specifically for the PS3 are few but the amount should go up significantly within the month (holiday season) and several months afterwards just because it's new.
Not sure about in comparison to the PS2 though, I like older consoles case games are super cheap:aok