re: Better pound for pound fighter in his prime: Roy Jones Jr. or Floyd Mayweather?

Don't see how you can say LHW was a weak division when Roy was unifying.

Virgil Hill - considered one of the top 10ish LHW in modern boxing. Yes Virgil Hill was old but he proved he wasn't past his prime by going up and winning a title at CW after getting knocked out by Roy

Eric Harding - coming off wins against Tarver and Montell Griffin

Merqui Sosa - not really a LHW but was a very dangerous opponent. Sosa beat guys like Prince Charles Williams, Glen Johnson. He gave James Toney hell. Before his fight with Roy Ring magazine had dubbed him as having the best chin in the sport. Roy got him out of there in 2

Julio Cesar Gonzalez - we have been through his accomplishment already

Mike McCallum - yes past his prime but nobody had ever came close to dominating him the way Roy did.

Reggie Johnson - former MW champion

and others