@megafanflash: 4 days late to this,but OPM isn't finished and there's nothing to say that power level of Saitama's enemies will cap out at Boros strength or he'll remain the strongest villain to enter the show. He "could indeed" be the strongest, but we have no way to know.
I'm gonna side with DSK here despite Ryuko having amazing regeneration feats since he actually has a confirmable speed(which may or may not be faster than her),and from looking through an RT for her really quick,it's pretty vague where she stands in that department.
I think she may actually have more than enough durability to tank his hits here,since BoS Ryuko took hits from a guy who had gloves that could make him hit as hard as steel, and she later goes on to no sell that and hits from people magnitudes stronger than that guy. I'll probably lean on her taking the win,as DSK can't really put her down.
@totallynotjucas: You're just reinforcing my point here lol. Yeah Boros is not the strongest in verse,as there's more enemies and characters yet to come,as was the case with DSK,who at the time was just the next one up on the villian-of-the-week chain.
Even in the case of OPM and Saitama's unknown upper limit of strength,this formula of "bigger and BADDER villian than the last" is present,it's just that by feats and showings the opposite was actually true,but a show made to entertain us isn't going to care about that. DSK was presented as the next big bad thing,and thus he was.
TL;DR: What cromular said, and me + you agree with each other here.
The lack of effort Saitama displayed in beating him doesn't say that this formula is false and not present in the show,it's still a shounen,and that's just how Saitama has been commonly displayed in-verse. Casually beating his opponents.
@totallynotjucas: Most narratives/stories,especially shounens,have what are supposed to be the "stronger enemies" show up later in series for the sake of presenting a bigger challenge to the protag or whatever plot-induced reason. It's an extremely common formula.
I should have replaced implied to be stronger with INTENDED to be stronger. Arguing only with feats DSK gets demolished by Beefcake,and Vaccine Man as well.