It's hard to do comprehensive audio quality comparison of multiple audio options in the same model of a car — you'd have to have access to 3 cars of the same model for a couple of hours each with different audio systems to test at various driving situations. It might be easier to take a statistics approach here, a formal or informal poll.
I'll start: have HK, very happy with it. For me, HK came in a package, but I would have gotten it anyway if it didn't. The many thousands more for B&W system were better spent on driving performance items (OEM and after market).
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G05 X5 x40i (04/2019 mfg, Canada) on S18A-19-11-540
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