<p>Bonaparte is really all we have to go off of, but based on how powerful he was, it seems like they' can both be very powerful, though in slightly different ways. With Hexenbiests, I think they are more knowledgeable when it comes to potions, spells, and magical objects, whereas Zauberbiests may be able to fair better in a toe-to-toe fight. I don't think there's a major difference when it comes to telekinetic power though.
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