Marvin Hagler, when he peaked in about 1983, he had to be the most complete fighter in history, Endurance, power, speed, ability, heart, intelligence, work ethic, determination, experience, and a solid corner as well, i honestly can't think of any weakness this fighter had:huh:amen
Probably would be Langford or Fitz. Both had ungodly power that transferred far above their pay grade. Total physical freaks.
Duran and Robinson. Duran was as strong as an ox (did not get bossed around by bigger men), but Robinson was as fast as a rabbit. Roberto was the bull and Ray was the matador. Both hit hard, had iron beards, great stamina. Both were born to become the two greatest fighters ever. Both were freaking animals. BTW They are my #1 and #2 fighters ever.
Athletically speaking RJJ comes to mind But, if we are talking about skill I think of monzon. So relaxed and just seemed to throw at the right time. He had a special kind of skill and dominated with it, and he didn't really possess the physical strength and speed a lot of other greats were blessed with.
Talent is overrated .Its all interest in what you find aesthetically pleasing that makes or breaks you in my humble opinion.