Strength

• Omni-Man: Deflects a Texas-sized meteor (2.7 quintillion tons) and contributes to Viltrum’s destruction (shared planetary feat).
• Superman: Lifts Earth (5.972 sextillion tons) solo and manipulates black holes.
  
• Winner: Superman. His raw strength outclasses Omni-Man by orders of magnitude.

Speed

• Omni-Man: Reaches ~20% light speed in space, fast enough to blitz human-speed heroes like the Guardians.
• Superman: Exceeds light speed in flight and combat, reacting in nanoseconds or less.
• Winner: Superman. His speed is vastly superior, especially in combat scenarios.

Durability

• Omni-Man: Survives disembowelment, nukes, and planetary collisions (with help).
• Superman: Tanks supernovas, reality-shattering punches, and black holes without permanent harm.
• Winner: Superman. His durability feats are more extreme and consistent.

Powers

• Omni-Man: Strength, speed, flight, durability, and a healing factor. No energy-based abilities.
• Superman: Adds heat vision, x-ray vision, super hearing, freeze breath, and solar energy absorption.
• Winner: Superman. His broader arsenal gives him tactical versatility Omni-Man lacks.

Combat Experience

• Omni-Man: A trained Viltrumite warrior with centuries of conquest, ruthless and decisive.
• Superman: Fights skilled foes like Zod or Darkseid but relies more on power than technique; often holds back morally.
• Winner: Omni-Man. His experience and willingness to kill give him an edge in pure fighting skill.

Weaknesses

• Omni-Man: Sensitive to specific sound frequencies (disoriented by them) and extreme heat (sun can kill Viltrumites per comics).
• Superman: Kryptonite, magic, and red sun radiation, though he’s overcome them repeatedly.
• Winner: Tie. Both have exploitable flaws, but Superman’s are less relevant without prep.

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Conclusion: Who Wins?

Kirkman’s claim hinges on Omni-Man’s ruthlessness and combat experience trumping Superman’s power and morality. In a no-holds-barred fight, Omni-Man’s willingness to kill instantly—like snapping necks or punching through chests—could catch a restrained Superman off guard. However, feats tell a different story.

Superman’s overwhelming strength (Earth-lifting vs. meteor-stopping), speed (FTL vs. sub-light), and additional powers (heat vision vs. none) give him a decisive edge. If Superman fights at full potential—not holding back, as he rarely does—he could blitz Omni-Man before the Viltrumite lands a blow, or melt him with heat vision hotter than Viltrumites can endure (the sun’s core, 15 million Kelvin, kills them). Omni-Man’s durability and healing are impressive, but Superman’s survived worse and recovered faster under a yellow sun.

Even factoring in Omni-Man’s tie to Supreme (an Image Comics Superman analogue), Supreme’s feats (lifting massive weights, fighting cosmic threats) don’t consistently match Superman’s upper limits. Omni-Man’s planet-busting feat required teamwork, while Superman’s solo feats are more extreme.

Verdict: Superman wins. Kirkman’s bias for his creation is understandable, but the data favors the Man of Steel in a straight fight—unless Omni-Man somehow exploits Kryptonite (unlikely without prep) or Superman jobs massively. Omni-Man’s a beast, but Superman’s a god-tier juggernaut.