to me it's sugar ray robinson,beautiful mover,even warming up in the ring before a fight it's just poetry in motion,just a natural loose flowing athlete.
This is such a subjective thing...and for me it depends upon mood as well. I love watching Joe Louis throw those precision combinations, I love watching Arguello's laser-guided right hands, I love watching a Chavez left hook to the short ribs. Duran at his peak turned aggression into an art form. Tyson for me did the same in the 80's. Hearns either as a boxer or trying to bomb a guy out of there was simply magnificent. Obviously a SRR is good to watch, but I'd have loved to have seen him at 147 which sadly is in sparse supply. I've never been one for pure, defensive boxers. A guy skittering around the ring throwing out little more than a jab doesn't do it for me.
Oscar De La Hoya in my opinion, a real pleasure to watch perform. There is nothing better in Boxing than watching the Golden Boy's left hand go to work.