Originally Posted by SehrSchnell
Great looking car, great exhaust note, one of the best interiors in the business, but mediocre performance for the price. Would make a fantastic daily driver, but will be a lackluster on the track.
Not sure what you meant by "mediocre" and "lackluster", but if you meant these terms to mean not very quick, there are two extended videos in these very pages showing the RS5 to be a bit quicker than the M3 on track, by virtue of superior traction coming out of turns, and slightly better low to mid range torque.
These were tests by magazine types (as opposed to pros), meaning they're better than most of us on track, but far from Godlike.
The cars were closer than half past six in both tests by the way, but the Audi was just that little bit quicker, and consistently so.
Acceleration? Again, very, very close.
In short, pick 'em. They're both winners - unless the RS5 is U.S - priced more against an M5 than an M3. History suggests that won't be the case, but you never know.