I personally choose Xbox360, PS3 won at graphic departement but X360 is still good enough, especially if you dont give a damn about graphic so much.
Games variety are same, but it seems this year many developer releasing their games at pc or X so there will be more games for X later.
Nothing so different for the controller if you get used to old xbox controller you should be able to handle this one, it also goes with ps3 too, no different from ps2. X360 controller need batteries, while PS3 need to be recharge every 4 to 6 hours if i remember.
If you want to know exclusive only games, i think there is a section that discuss about that at ign, for both consoles.
Oh, and i read in game and technology related magazine from my country that someone already knew how to playing fake games on PS3, piracy for PS3 sooner or later.
In case you might intrested in wii, it got worst graphics than the other two but of course it has a LOT game variations too, though you need to buy the other special controller to get a better gamming experience for example a gun or tennis controler, well you can still play with the normal one.