Between my F31 and Q5, honestly in regular day to day drives the differences are practically imperceptible to me. Tires are far more important but assuming they're the same I personally feel quattro is a bit more competent, a bit more sure footed but also a bit more muted. You get the sense that the car is telling you "don't worry I got this sorted" but doesn't tell you what it's doing. BMW's system is probably a bit less high-tech but as a result I feel like it's a bit more communicative.
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