Ignoring all the horse **** that Pacquaio fans are throwing around the forum at the moment, Mayweather Jr can rightfully say he is definitively "the best" in his generation of fighting, the other long serving champions he's either beaten (Pacquaio, Marquez, Mosley, ODLH) or don't have the career/boxing credibility he has ( Klitschko brothers ) If we consider generation to be 15 year blocks and say Floyd was definitively the best from 2000-2015, how many other fighters would be viewed in the same way? 2000-2015 - Floyd 1985-2000 - Tyson / Jones Jr / Lewis 1970 - 1985 - Tyson / Ali / SRL / Hagler 1955 - 1970 - Sugar Ray Robinson / Ali / Marciano ? 1940 - 1955 - Sugar Ray Robinson? 1925 - 1940 - Joe Louis? 1910 - 1925 - Jack Johnson Not very many eras have a definitive best fighter when you think about it.
Roy Jones will be looked back upon as being he best of his generation. Few will argue too much with that. Floyd is obviously another candidate. Those are the two stand-outs of the last 25 years.
It's hard with Jones Jr because that would be my pick for the best guy during the 1990s without question, but you've got tough opposition in fighters like ODLH, Trinidad, Lennox Lewis, etc. If you do it in decades, I think Jones Jr gets 1990s hands down though but most fighters fight for 15 years these days. 15 years tends to be about the average career (start at 20-25 end at 35 - 40ish)
I'm Lennox's biggest fan. But he didn't dominate like RJJ did. Despite having huge advantages over most people he fought. I wouldn't say Lewis was a better fighter than RJJ. Tito and DLH were good fighters, but lost some big fights. They aren;t candidates either. Regarding Tito - you could ask most mainstream sports fans in the UK (where I live) who he is and they wouldn't have a clue. I know this point is off topic somewhat, but he's not known at all in the UK. DLH might be.
Man so hard! I can only say Floyd without a doubt. everything else can be questioned. I wish era's were decade but there not because fighters fight over 10 years