Originally Posted by dwboston

I'll say the A8, though there are things about the A6 that I prefer, such as the HUD implementation and some more customization options. The A8 is definitely less sporty than the A6, but more refined and quieter. It just feels more solid than the A6. My biggest complaint with the A6 is the driver's seat - it's just really uncomfortable. My back was aching last night after driving it for 1.5 hours total yesterday.

Whenever I have the A6 in for service and get a loaner A4 (or similar), it feels like I'm driving a go-cart compared to the A6. That's the feeling I had yesterday. There was nothing different about the way the A6 drives after the repairs, but it was a noticeable difference between the two. And to be fair, there should be, given the $35k difference in MSRP between the two when new.