This has always been a debate: Which German car maker, between Audi, BMW and Mercedes-Benz is the best
Personally, I think during the early 90s, Merc were at the top, BMW 2nd and
Audi 3rd, but when Mercedes started to cut costs in the late 90s, in my
opinion they dropped to the bottom leaving BMW and Audi to fight it out.
During the early 00s I think BMW ruled, but around 2005/6, Audi has without a doubt climbed to No.1, with fabulous new cars (RS6, R8) and a 25% sales increase worldwide.
Recent good cars:
Audi: S3, RS4, S5, RS6, S8, R8, R10 TDi
BMW: M3, M5, M6
Mercedes-Benz: Most AMG models, SLR
It's a tricky one