Audi has not only been wining but dominating almost every road racing championship including Le Mans for the past six or seven years, I don't keep up with the DTM championships in Germany anymore but in the past they kicked some serious ass competing with AMG and BMW.
we all know there is no better place than the track to proove your know how.
Does this mean they produce the best road cars in the world today? For some people yes, but not for all. Some factors such as "feel" and "balance" are subjective not too mention the all important brand loyalty factor.
For me these debates are like the olympic line up at the men's 100 meter dash, they are all extra ordinary athletes and every one of them has a chance at crossing the finish line first. But does it really make any sense to sit there and debate which one would win and why one is better than the other?