Well. Given that yuve played mostly on Playstation brand until now, you probably will be more comfortable with the PS3 controller. Although if yu have a chance to pick up a 360 controller and feel it I would recommend doing that.
All in all I feel the controller is the most important determination (all biases and tech points aside). If you plan on putting your hands through hundreds of hours of gaming, yull want the controller that feels best to you.
Exclusive titles. Well. there are some good threads here that list them, or at least list the PS3 ones for 2009. the 2008 titles yu may wanna look at too. Really this is a category of to each his own. The easiest way is to genre-cast it though. It looks like 260 is getting RPG heavier all the time. Fable II and Mass Effect (hybrid) are two major, major 360 exclusives. Racing games also seem to be a strong point for 360. Action/Shooters.. it really just depends on what game you really want and what will appeal to you. If KZ2 is it, than there ya go, if not, maybe Gears. No to Gears, hey GOd of War is solid. I think there is pretty even compitetion for the most part, the rest is just bias. The happy thing is Bioshock, MK vs DC, Guitar Hero World Tour, and Call of Duty WaW is on both.
Also, you may want to look into downloadable titles available on XBLA and Home. Until recently I think theres been no comparrison, but I thinnk SONY has stepped up now. still games like Galaga Legions and Castle Crashers, make 360 much more appealing to me personally.
"Let justice be done though the heavens fall." - Jim Garrison
"Ask not your horse, if ye should ride into battle" - myself
