I still say technically, effectively Mayweather's style is far better. He is more accurate, and harder to hit. He doens't leave himself open, and though Oscar has been effective he hasn't been able to beat top competition (Hopkins, Whitaker, Mosley, some might say Trinidad though I say he won that). I think Oscar's amazing power plays across evenly with Floyd's speed because Oscar's power at welterweight and lower was incredible. However if you watch them against Gatti for example MAyweather had a much easier time because he can read an opponent so well, and counter so effectively that an opponent is completely bewildered.