i got a PS3 and it's cool. i'm not sure about this (maybe all the xbox peeps out here can confirm this) but all my friends who own a xbox say that it scratches their games after each use but they intend to use the game till it can't be read any more (they'll buy the game again if it doesnt work no more).
the XBOX 360 has an advantage for motion detecting (if that is the way you are going). you can dance in front of the screen without holding some kind of object (wand). While the PS3 has a wand just like the Nintendo Wii. but you can buy attachments like a gun for the ps3 wand to shoot around.
PS3 remote controllers got the vibration thing (i dont got one cus they cost the same as a freakin video game) and i'm not sure if XBOX 360 does (friends dont got em)
i believe that the xbox 360 does have more bloody games compared to the ps3 (well commercial-wise since i haven't gone to a gamestop or looked at video games for a while).
online gaming is kinda addicting, depending what game you are playing. luckily for me, i always use fake names and all so my identity wasn't stolen when PSN (playstation network) got hacked.
if i was a hardcore gamer (even though it sounds like i am one) i would've bought a XBOX 360 as well but i'm not so i opted for the PS3 just for GRAN TURISMO 5 (which i still haven't bought and am sure that it's just as awesome as its predecessors) and KILLZONE.