It is difficult to know for sure who wins a fight between Superman and Iron Man. Furthermore, it is unlikely that the public will watch the cinema, as the characters appear from different franchises.That said, Iron Man is much more dependent on Superman's technology, or can give Man of Steel an advantage. However, Iron Man proved useful against incredibly powerful enemies, especially Thanos, or what could mean trouble for Superman, there was no problem for the man of steel, who was already an immortal, and the man of Ferro is a human being dressed in armor totally crushed in the hands of the superman.