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Brushing up on the Quattro wikipedia page (which, fwiw, a lot of is in dispute), it looks like Quattro actually includes Torsen center diffs on some cars and Haldex on cars with a transverse engine mounting. Similarly, some have limited slip diffs and some use electronic locking like xdrive. Anyway, point is picking sides isn't especially easy, although I now at least see what you mean in terms of what you consider superior vs xdrive. I'd still make the argument that the difference is pretty difficult to discern in most rational situations and to most drivers, and that from an engineering perspective balancing cost vs objectives for the particular target market, that xdrive represents a pretty solid set of choices.
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