Well the thing is, this argument only works with someone like say spider-man. He's more durable than a regular person but not SUPER durable. He's lost fights because he was holding back and trying not to hurt somebody and got blasted.
Superman has HIGH tier durability. Higher than the hulks, that's for sure. Hulk is not capable of one punching him, or of koing him with a single or a few combinations. It would take a prolonged beating. Which would give superman more than enough time to realize hey, this guy is really strong. The second he realizes that, other than saying he will fight like a retard for no reason, there's nothing stopping him from using his speed and ranged attacks.
They've fought before in corossovers, and even there using the "everyone fights like an idiot" rules he beat him with sheer power and durability. He's stronger AND tougher than the hulk, AND he's thousands of times faster and has ranged attacks capable of seriously hurting the hulk. The only way Hulk wins is if you gimp superman by saying he will only use one of his powers until he's beaten to death.... for some reason. Even then in straight hand to hand rock em sock em robots fights supes is 3-0 vs hulk in the comics. Hulk isn't better anywhere except maybe regeneration. Superman can regenerate any time he chooses tho by flying into the sun. Doing so makes him stronger as well.