PS3 controller for sure, greater range of motion on the sticks and a smaller deadzone, makes for better movement and accuracy. The 360 bumper is also crap compared to the PS3 r1/l1. The PS3 sticks also have a textured surface which make your thumbs stick to them and not fall off like the 360 controller.
The left analog stick is also located in an odd position which does not fall in line with a standard hand placement. 360 does have better triggers though.







