Stormbreaker has the additional power to summon the Bifröst, allowing Thor to teleport anywhere in the Nine Realms. Screen Rant has identified Stormbreaker as the more powerful of the two, based on this ability, as well as it being a much larger and edged weapon.
Although Stormbreaker and Mjolnir have very similar properties and powers, Stormbreaker is the most powerful weapon wielded by Thor so far. The obvious reasons are that Stormbreaker is the physically larger weapon out of the two, and not to mention that it is an axe, which could well be more dangerous than a hammer.
Unlike Mjølnir, however, the weapon is not enchanted to prevent those deemed "unworthy" from holding it, making anybody with sufficient strength capable of using the weapon.
In the end, Thor is able to coexist with both hammers, with Mjolnir being treated more as pet or a treasure, something he loves and handles with care that ties him to the events that made him into a great hero, while Stormbreaker becomes like a child, carrying the future as it is wielded not by him, but by someone he ...
Mjolnir is a hammer, and was enchanted by Thor's father, Odin, so that only those the hammer deemed "worthy" are capable of wielding or even lifting it. Stormbreaker is an axe, and although it does not have such a worthiness enchantment, its power is such that a mere mortal attempting to wield it would be driven mad.
Storm breaker is meant to be the strongest weapon of Asgard and could even summon bifrost, says Eitri. But there is no enchantment or spell on it like it was on Mjolnir. So one doesn't have to be worthy to weild it, just the strength to lift it. Clearly Thanos is capable of lifting it.
As Thor described in Infinity War, Stormbreaker was a “Thanos-killing” weapon. Like Mjolnir, Stormbreaker is one of the most powerful weapons in the universe, and both Uru hammers nearly deal killing blows to Thanos in both Infinity War and Avengers: Endgame.
Can Thor (with Mjolnir and Stormbreaker) kill Syder Cut's black suit Superman? Yes, indeed Thor would easily win against Synder Cut Superman, but it will NOT be an easy win, because Synder Cut Superman is also very powerful and has many feats. So Thor would win, but with really high difficulty.
Meanwhile, MCU Phase 4 saw Stormbreaker being wielded by Thor, Gorr the God Butcher, Love, and anyone else who was strong enough to actually lift and swing it. This is because of the respective origins of both legendary Asgardian weapons.
This is a very simple answer that a lot of people don't understand: You don't need to be worthy to lift Stormbreaker! Unlike Mjolnir, Stormbreaker was never enchanted by the forefathers to only be held by the “worthy”. It was simply a powerfully forged weapon with near-indestructible properties.
Because it could kill thanos, is more powerful and thor panicked. Had he thought to call Mjolnir thanks would have gone to catch it and it would have knocked thanos on his bottom or something similar. But because thor was reliant on stormbreaker because it was more powerful he did it without thinking.
The movie doesn't explain Thor's motivations for giving up Stormbreaker, but it makes sense that Chris Hemsworth simply wanted Love to have a powerful weapon to aid her in battle. It's unlikely that he could give her Mjolnir, considering that so few people in the MCU have been deemed worthy of its power.
Stormbreaker can summon the bifrost and Hela is stronger in Asgard. Thor can teleport her and himself and open her chest killing her, or cut off her limbs ir head. Plus, Stormbreaker is stronger than Mjolnir.
Turns out, Thanos was taken unawares. He had just incapacitated all the heroes who tried to stop him. And did not see Thor — or Stormbreaker — coming. Or he could have just changed reality and turned Thor into a puddle of water.
Bill's been without Stormbreaker for a while now, as, in last year's Thor #3, Thor destroyed the powerful hammer after the pair got into a fight over his decision to join Galactus in a fight against the Black Winter.
Many viewers have pointed out that Thanos was able to lift Stormbreaker without a problem, but this is because the ax isn't enchanted as Mjolnir is. Others believe Thanos lifted Mjolnir (although briefly) and have even argued that he would be worthy of doing so.
Who would win in an MCU fight: Odin or Thanos? Without the Infinity Gauntlet, Thanos stands little chance against Prime Odin. Odin is stated to be able to shatter the Earth.
It's important to note that the rules around worthiness had been temporarily suspended to allow this to happen. As soon as the fight was over, Superman couldn't lift the hammer anymore. However, under normal circumstances, without any weird interference, Superman is worthy of Mjolnir.
Can Thor beat Superman with Stormbreaker and Mjolnir?
Can Thor (with Mjolnir and Stormbreaker) kill Syder Cut's black suit Superman? Yes, indeed Thor would easily win against Synder Cut Superman, but it will NOT be an easy win, because Synder Cut Superman is also very powerful and has many feats. So Thor would win, but with really high difficulty.
