The Saturn controller was indeed the best of those with 6 face buttons, I think. There are many controllers I prefer over it, but that one was damn fine at the time, that's for sure.
I modded an old SNES controller to be USB and it's one of the best things I've ever done. I use my 360 controller on most games on PC, if I need one, but for the classics, I use the SNES controller.