Thats easy its Tito cause he never won any rounds on his effectiveness, it was more of Oscar losing the last 3 on his own than Trinidad doing anything.
trinidad, pacquiao, floyd, mosley 2, hopkins - trinidad won because of de la hoya running - pacquiao won cuz de la hoya was shot to **** and weight drained - floyd beat an older de la hoya but it was a close and uninspiring fight but it was at least against a de la hoya who wasn't shot, nor weight drained - mosley was on steroids, but the fight was impressive - hopkins is the only one who didn't have a ton of advantages in his favor. he was just bigger. not to mention he was out boxing de la hoya in the process and then koed him. but none were really that impressive. that's a way of telling a good fighter.
Pacquiao's was. You can argue it wa Teinidad's since it was a close fight even a robbery. Hopkins gets a look since 160 was a weight to high for De La Hoya. When you consider that all of De La Hoya's losses with the exception of his loss to Pacquiao came when he was at or very close to his best. Pacquiao's win over him stands out as the least impresive.
Pac fought at 130 that year and moved up 3divisions in 8 months to make Oscar quit on his stool while being the underdog. I know Oscar wasnt prime but it was very impressive that night. Least impressive is either mosley 2 or trinidad cause they didnt win those fights.