There isn't a way, or at least it would be a futile impossibly complicated exercise... to establish unanimously which one band is the single most unique in metal. However. Reading that title should stimulate those neurons a little as it's one of those questions with multiple angles. Surely, you've got a couple of names you're thinking of already. Think about it a little more and tell us, but it *can only be one !* I'll let you figure out what you want the definition of "unique" to be. But come up with JUST ONE band name, with a few explanations.