Saitama's power of 100 is unmatched and would easily overpower Omni-Man's power of 55. Despite Omni-Man's durability and flight capabilities, Saitama's brute strength and unbeatable skill would prevail. Saitama's signature technique, "One Punch" would take down Omni-Man in a single hit. Even if Omni-Man were to turn himself into a living kinetic weapon by flying at hypersonic speeds, Saitama's speed and agility would allow him to dodge the attack. Overall, Saitama would come out as the victor due to his overwhelming power and skill.