I don't even understand why people would even think superman would win. Okay I will admit superman is strong, but goku is just like 100x stronger. He has 4 forms of super sayians, he can telelport he is extremely fast. He has all these super moves, and compared to superman he would just get owned quickly. It's just no Comparence to their strengh, the only think goku and superman would have in common. Is that their both aliens thats it. He just wouldn't win, it's too obvious I mean if you look at dragon ball z, you would know superman would not stand a chance.