| Deadhead, tire width is another factor that comes into play, something no one else here has mentioned yet. The A6 has WIDE tires, even for it's increased weight and by comparison your Honda had skinny ass tires. The tire width to car weight ratio makes a difference driving in snow. I suspect this is one of the reasons my Subie does very well in snow with all seasons. Same weight as the S4 but has 195's rather than 225's.
Another point of order, most AWD systems today perform pretty close to the same, and are relatively invisible to the driver. While I do think the Torsen center diff Audi uses is probably the least likely to fail, nearly all systems use the brakes to control traction and "guide" torque flow to the wheel with the most traction.
Annoying if you ask me.
I'd prefer an AWD system with no electronic aids and manually locking front, center and rear differentials.
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