A rather foolish poll, comparing console controllers / gamepads is all well and good, but a mouse and keyboard is on a whole different level. (That said, I'm surprised how even the poll is PC[86] - 360[86] atm).
Anyways, contrary to most people, I prefer a gamepad for my shooters. Sure, a mouse and keyboard is more effective, but point and click along with tapping keys has no "feel" to it, while when using a gamepad I can get way more into it and really feel "in the action". The same goes for flying games and racing games. For everything else (RTS, TBS, etc..) mouse and keyboard all the way.
And for gamepads, the 360's is my controller of preference so far in life.