Suggested by Sonic Atomic Skull is a strong fighter and he has gone up against Superman in the past but I would say that his skills are never quite up to the task. Meanwhile Starbreaker can make himself even stronger than Superman at times. He is more agile and versatile due to his speed and flight. He should be able to pepper Atomic Skull with powerful hits throughout the fight until that guy finally goes down for the count. Starbreaker wins.