Ok look i dont know much about Whitaker but i have watched alot of SRL and some PBF and if you are comparing who they beat SRL hands down wins it Wilfred Benitez, Roberto Duran, Thomas Hearns, and Marvin Hagler come on the PBF is undefeated but the best he beat was a old oscar a far form shot but still a old oscar its hard to compare SRL because he is the ALI of lower wieghts.