Bhop. ruled MW for yrs, unified the title, won his biggest fights there by KO, moved up to beat Tarver and Winky who were p4p fighters at the time (I think Tarver still was), whomped Pavlik as a huge underdog
Pac - Barrera x2, JMM, Morales x2, DLH
Floyd - Corrales, JLC x2, DLH, Hatton
B-Hop - Tarver, Wright, Pavlik, Tito, DLH
Roy - B-Hop, Tarver, Toney, Tito, Ruiz
I'll go with B-Hop since he clearly defeated his opposition. Roy would be a close second.
Yeah no question for me it's BHOP.