Best: My third-party Brooklyn (That's the companys name) PS2 controller. It's light blue, shines in the dark, is see-through, and is slightly larger than the average controller. Something that's good for me, because I have quite large hands.
Worst: Any controller that thought it would be a good idea to move the left joystick slightly higher than the right one. Why is this a good idea? It feels really awkward for me, having to move my left hand higher up than my right hand. I prefer symmetry between the joysticks, thank you very much.