For those of you who don't know, Thunderstrike is a mace used by another Thor variant: Eric Masterson. It basically has all the powers of Mjolnir and Stormbreaker, except it's a mace. Now, why do I prefer this variant of Thors weapon better than Stormbreaker? And why would I choose this weapon specifically other than the other variants like Jarnbjorn or Ultimate Mjolnir?
Let's start with why I want Thunderstrike. First of all it's design, for those of you who live under a rock, a mace is much like hammer in which it's also a bludgeoning weapon, except it can be used to smash on all sides rather than a hammer having only 2 ends to cave someone's head in with. Except with this mace specifically, which seems to be more a triangular wedge shaped, with 3 flat sides and the triange side facing up. As for the rest of the mace, the handle is significantly longer than Mjolnir, but not as long as Stormbreakers. This gives it more of a Sledgehammer like design, compared to Mjolnir, this is a direct upgrade seeing as Mjolnir (when still in Thors hand) was a much more close range oriented weapon. Not only that, but the wrapping around Mjolnirs pommel that was once used to spin the hammer, has been changed to a metal chain (which I believe is much more efficient since any Hammer spinning at that speed wouldn't be held together with a simple leather rope).
As for my opinion on Stormbreaker, its a really bad design. First of all, it looks clunky as hell, the extended hammer head combined with the axe head makes it look imbalanced, like would be heavier on one side than the other. Not only that, but the handle just looks boring and hard to hold, I think the idea of Groot making the handle is good, but this just makes it look like you could never grab it without getting splinters. On top of this, the handle is WAY to long, whenever i see Thors design with Stormbreaker, it just sticks out like sore thumb, the MCUs choreography makes it look slow and heavy, with no interesting moves or special properties. Sure he can throw it and call it back, but its nowhere near as cool when Mjolnir, Captain America's shield, or even the Leviathan axe does it. And while Mjolnir didn't have the best design, it was iconic and what mattered was that Thor used it in interesting ways and attacks, like when he placed Mjolnir in the dragons mouth to restrain it, something Stormbreaker can't do. That's right! Anyone can pick up Stormbreaker! YOU DONT HAVE TO BE WORTHY! The next thing about Stormbreaker is the Bifrost, which I do see it as a good thing for Thor to have, but I just wish it wasn't wasted on such a trash weapon.
I guess what I'm trying to say is that the MCU could be done better with Thor after endgame. Who once used to be confident man filled with nobility and love after throwing away his arrogance and pride, is now a painfully unfunny joke of a man who has literally nothing left to lose and who needs to "Find himself". If there was anything good that could've come out of replacing Stormbreaker, would be that Beta Ray Bill could've used it in a future movie. But...oh well