i don't know. both dominated. pac being the smaller fighter stopped oscar while floyd being the bigger fighter put a shut-out.
Floyd was the heavy favorite against Marquez. Pac was the underdog against Oscar so I'll go with Pac. I would also add the Pac made Oscar quit while Floyd didn't make Marquez quit but I think Marquez not quitting had more to do with his warrior mentality.
Mayweather completely neutralizing Marquez with his size and athleticism does not a "great" performance make. That was an absolute joke.
Oscar was non-ranked, lost 20lbs in weight, was severely weight-drained, and was busted up in his previous fight against Forbes. Clearly Mayweather's performance was far superior over the p4p2 fighter of the sport whom many thought defeated Pacquiao twice. :deal