This would be with the most powerful versions of both characters from DC. And the most powerful version of the Gladiator from Marvel
As a huge fan of Chris Claremont, I still think that the Big Guy, the OG superhero would take Guardian down with some trouble, then offer Gaurdian his hand of friendship.
Because he’s Superman.
The most powerful of Superman? So we talking future Superman? The golden god one? Superman Prime, I believe?
Guardian is dead. He stands no chance.
I’m picturing that one page from All-Star Superman and crying a little. Of course he’d do that. He’s Superman.
That’s a hard one I would say gladiator since he can fight more than just brawl like Superman and he has a whole empire at his disposal