Mjolnir and Stormbreaker are darn similar in their properties but stormbreaker has an edge over mjolnir when it comes to power.
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Image Source: Instagram
Both weapons help Thor to summon lightning, but since Hela destroyed mjolnir single handedly, it means Thor's hammer is destroyable.
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Image Source: Instagram
On the other hand we saw stormbreaker taking the hit of all 5 infinity stones and still managed to almost kill Thanos.
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Image Source: Instagram
secondly stormbreaker is physically bigger than mjolnir and can also summon bifrost allowing thor is travel anywhere within seconds in any of the 9 realms
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Image Source: Instagram
Thor also prefers Stormbreaker over his hammer as we saw in endgame when cap and thor were sharing Stormbreaker and Mjolnir.
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Image Source: Instagram
Storm breaker gives thor more advantage over his enemy as compared to Mjolnir which is a very big factor to win fights and that's why thor prefers Stormbreaker over Mjolnir.
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Image Source: Instagram
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