Well.. For my controller preference, I'd say PS3 controller is better than 360. Overall for me that has the best feel of a controller, but if I'm playing FPS I'd hold a 360 controller anytime over a PS3 controller.
One thing that I do hate about the design of the 360 controller is that they haven't rid of the horid design(the chunkiness of the controller). I hate holding that thing for a long time.