At Welterweight, I'd take PBF over Roberto Duran (I know that will piss off the many Floyd Haters and the "old school" fans, but thats just the way I see it). Leonard/Mayweather would likely be a snoozefest which could go either way. I think Hearns at WW with his punching power, reach and speed would give Mayweather a TON of problems, because anyone who was ever successful against Hearns did it by overpowering and slugging with him and I'm confident Mayweather really doesn't have the power to bother Hearns too much at WW.

But no matter who wins, there is no doubt in my mind that FLoyd Mayweather could compete with those guys. I know the many Floyd haters would have everyone believe that Floyd would be nothing but a trial horse in these great areas, but the fact is Floyd Mayweather is a marvelous boxing talent that could compete with any era.