Between SRL, Whitaker and PBF, I think SRL is the most complete boxer of the three. Whitaker was all defense... and while it's easy to marvel at, you gotta have a good offense to go along with it. PBF is fantastic, but I'm not much into the shoulder-roll type defense. And sometimes Floyd can also pay too much attention to defense, at the expense of his offense.

Sugar Ray was pretty awesome on both sides of the fence. And don't forget... he had some classic battles with some of history's best fighters (Hearns, Duran, Hagler, Benitez). That alone puts him a cut above Whitaker and Floyd, IMO.