Pernell didn't fight the same quality IMO as Mayweather... some good names he has are Roger Mayweather(who was pretty good, but nothing like his nephew... in the ring at least), Vazquez(who did well against Winky, but is slow, and I think Winky had the wrong still for him), McGirt of course was IMO the best he fought, but Mayweather has already foughten very fast and offensively Skilled Zab Judah, Corrales, Chavez, Castillo, Corrales(who is both fast and strong). Also I just watched Baldomir and Mayweather, and Mayweather is not often straight up hitting and running... many times in the fight he comes up to Baldomir and boxes him on the inside or throws combinations against Baldomir where he is hitting Baldomir flush and doesn't get hit once. IMO its impossible to say who's got the better defense especially in terms of skill because Whitaker had a defensive advantage fighting southpaw.