Suggested by Sonic Solomon Grundy is one of the most powerful villains around. At his best he was even able to overpower Superman for a little while. As strong as Red Hulk is, he’s not doing that. Red Hulk’s greatest advantage in this fight is that he actually has long range options while Grundy has to fight up close. This won’t help a whole lot though because those options aren’t enough to significantly damage Grundy. So all Grundy has to do is get close and then it’s curtains since he’s that much stronger. Solomon Grundy wins.
How about Thor vs Red Hulk?
Thor definitely took him down a few pegs