Thanos's combination of cosmic power, intellect, and durability gives him the edge over Thor's raw might.
This matchup has played out in both the comics and the MCU with different results. In the MCU, Thanos decisively beat Thor in Infinity War's opening scene and in the final battle. In the comics, Thor has won some encounters through Mjolnir's enchantment power.
Thanos without the Infinity Gauntlet is still an incredibly powerful being โ one of the strongest in the Marvel cosmic hierarchy. His durability is borderline absurd (he's survived attacks from Galactus), his energy projection is planet-level, and his intelligence is among the highest in the universe.
Thor's advantages center on Mjolnir. As an enchanted weapon, it bypasses Thanos's physical defenses in a way that pure force cannot. Thor's God-blast is one of the most powerful single attacks in Marvel comics and has staggered entities far above Thanos's weight class.
The deciding factor is experience and cunning. Thanos is a master strategist who has prepared for and defeated beings far more powerful than himself through intelligence and planning. Thor is a warrior, not a strategist โ he fights with heart and power but not the calculated brilliance Thanos brings.
Thanos has cosmic-level durability, energy projection, and the finest strategic mind in the Marvel Universe. He's fought and defeated Thor multiple times in various continuities. Even without the Gauntlet, his base power level is in the same tier as Hulk and Superman. His intelligence is his ultimate weapon โ he doesn't just outfight opponents, he outthinks them.
Mjolnir's enchantment gives Thor a weapon that can genuinely hurt Thanos. Thor's strength rivals Thanos's, and his God-blast has staggered Galactus-tier beings. Thor also has the Warrior's Madness โ a berserker state that increases his power by a factor of 10 at the cost of reason. Stormbreaker in more recent continuities can even resist the Infinity Gauntlet.
Thanos takes a narrow majority through superior intelligence and cosmic-level power. Thor can absolutely win this fight on any given day โ Mjolnir gives him the tools โ but Thanos's combination of raw power and strategic genius gives him the edge in a best-of-ten.
Thanos also fights
Thor (Norse) also fights