>>280607416
Judging by results it's Saitama and Blast. Nobody saved the world as much as they did.
I'm talking about the webcomic Blast, I know we don't know much about his achievements but it's clear that he's done more than anyone else with the possible exception of Saitama.

Saitama was also willing to sacrifice his own reputation for the reputation of the other heroes and the association in general, even though he clearly wanted to have a good reputation.