DC Comics' Superman is without a doubt the most iconic superhero ever created, to the point that even DC's rival, Marvel Comics, took inspiration from the Man of Steel to create over the years no less than three characters based on the Last Son of Krypton. Obviously, none of them reached Superman's levels of popularity, nor his status as flagship character for the publisher, but their powers and abilities still put them among the strongest characters in the Marvel Universe.
Gladiator, Hyperion, and Sentry were created at very different times and for very different stories and contexts. While their powers look similar, they all have unique origins, which made fans debate about which one of Marvel's Superman «clones» is stronger, and if any of them could take on the original Man of Steel. This sort of comparison is always very subjective, but the three characters are different enough that it's possible to look at their origins and powers and then speculate who is the «best» Superman clone.
Related: Every Copy of Superman Created For Marvel's Universe
Kallark, aka Gladiator, is a faithful servant of the Shi'ar Empire from the planet Strontia, whose inhabitants train from a young age to obtain the coveted title of Gladiator, Praetor of the Imperial Guard. Gladiator's powers come from Strontian physiology, augmented with a technological process enhancement, and they make him one of the strongest characters in the Marvel Universe. Kallark has super strength, stamina, invulnerability, a healing factor, super speed, flight, heat vision, and freezing breath. However, he also has a major weakness. Strontian's powers are connected to their levels of confidence. If Kallark doubts himself, his powers are severely diminished, to the
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