My first real post other than that shirt thing lol. So i, as are a lot of people, a huge fan of OPM. I too can't help but wonder if any crossover matchup would herald such intense arguments as this one and i hope to clear up some things. Lemme just say that im not going to use any fancy words or math to sway you this side i just figured I'd give my input and present a different angle. Also before i say anything lemme just say as well that i grew up on DBZ and have favored Goku in ever matchup, even with Superman i favored him because i believed their physical skills to be equal and that since Goku had Ki that was the difference maker. However this i believe isn't this case for this one. I think Saitama would win for one reason only, he's supposed to be overpowering or overpowered. The show is supposed to be light and humorous and not about a journey to greatness. His overpowerness is part of his character and which is why i believe that since he is a character drawn and made to be that way he will always be that way and if he's not then he's not Saitama or OPM and it wouldn't even matter at that point. Its not even about their strengths and weaknesses its about the characters themselves and how they are made to be. Saitama will never lose its just not in the cards for him that is the reason.
Thanks for reading guys! Comment below if you wanna or if you disagreed to such and extent you wont comment just hit the back button and get on with your life! Later!