Well, they wouldn't fight, because they're both fundamentally decent people.
Tbh, he's probably a tier above Manhattan as well. He's UTTERLY broken, he's not just aware of the plot, he's actually able to change it to achieve his goals.
And Goku is just dumb enough to let him do it XD. Goku would square up, starting screaming to charge up his Spirit Bomb, or maybe a Kamehameha.
Then before he could even formulate the idea of throwing it, Thought Robot would have reverted him back to a child, and changed the idea of ever becoming a Martial Artist.
Before we know what's happened, Goku is a fat 40yo, running a small but successful Ramen shop.
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Well that doesn't sound like a lot of fun. A character that is too OP is boring. Even Goku was made weaker than several new characters (Daishinkan, Angels, Destroyer Gods, Hit, Jiren) in order to make him interesting. Hell, even Dr. Manhattan who is about as OP as you can get was outsmarted by Ozymandias, a mere man. It sounds like this form of Superman is invincible, even above Gods on an omniscient level, meaning the only character that could even beat him from Dragon Ball is Zeno.
Not really much of a content. Even if Goku is more powerful, Superman is the smarter and far more experienced person. Just because a fight is how Goku plans to solve it doesn't mean Superman will. He could simply put Goku in the Phantom Zone or use some other trick to avoid fighting Goku in the first place.
Unless this is the Superman written by Frank Miller. That one's an idiot, but anyone not Batman tends to be in Miller's hands.
This argument really comes down to what version of both characters are compared. Current version of Goku would beat Superman. Strongest versions of both, Superman would beat Goku.
The strongest version of Superman has done stupidly OP things. Held a black hole in his hand. Destroyed a solar system with a sneeze. There are versions of him that don't have a power limit cap, literal limitless power. Versions of him only dealing with other god type beings. Superman would do the Beerus-esque Hakai to literally just destroy Goku.
Still though, current versions, Goku wins.
Superman has never to my knowledge fought someone with Goku's speed/agility...
Goku can teleport anywhere he wants. Grab some Kryptonite and come back
Why is Superman limitless when he gets his strength from an alien sun (to his race). Back on his own world he wouldn't be anything exceptional... doesn't make sense.
Plus he lacks martial prowess. He's just a brute that solely relies on brute force... Goku on the other hand is a master with power to back it up.
Modern Superman or Prime Superman? There's vastly different in power on both.
Prime Superman would delete Goku easily.
Otherwise Ultra Instinct Goku, maybe even SSJBlue Goku can beat Modern Superman.
He's not. That's why IIRC, he's only been used about twice in the history of Superman. It's like Rune King Thor... When you can just blink dudes out of existence, it's hard to write a compelling arc.
But we're not talking about compelling arc here, we're talking about who would win in a fight. Thus, the boring, stupidly OP version of Supes comes out to play!
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