My preffered controller is the DS3/DS2/Sixaxis. I enjoy the lightweight nature of the sixaxis. The controller however is somewhat discomforting after an hour of play. The 360 controller is a bit large but it feels great and does not cause the discomfort I experience with the DS3 style controller. I dislike the trigger(odd location for me) and I strongly dislike the offset analog sticks and dpad. If the button layout on the 360 controller mirrored the DS3 I would be in heaven.
Probably the most pleasing controller of all time was the 6 button genesis controller. Comfortable and easy to use.