I think this thread is pointless in a sense, as it's obvious 99% of people here haven't driven either enthusiastically enough to warrant justifying an opinion on the matter. I include myself in that sentiment, too.
I think the argument that ''neither make a car that is track-worthy off the lot'' is seriously flawed. The M3 CSL is one of the most capable track cars, as standard, that I've ever seen. There were literally dozens at the 'Ring in September, and they were the only cars consistently lapping in the 8 minute bracket, on a TF day. The F430 Scuds and GT3 RS' weren't even managing that.
I agree Audi make a lot of very credible motorway cruisers, but that for me is what ruins the brand. They've become almost exclusively sales reps cars, along with, I'm afraid to say, the BMW 335 which is another astonishing car. Go back in history, and both Audi and BMW have made hardcore tarmac terrorists and comfortable but fast daily drives, which is why both command such a devoted following. I guess it depends whether you like your eggs fried or poached really. I've always loved BMW because I'm a huge fan of RWD cars. AWD cars are, generally, more capable, but this really is the main reason I dislike them. They're very mundane to drive, even though the stop-watch says different. There's a lot more to driving for me than bhp figures and lap times, the sensation of driving is the biggest factor, I prefer to drive fast rather than travel quickly.
But, I'd give a kidney for an E30 M3, and I'd give the other for a proper URQuattro. I'd die, but for a brief few minutes until my body gave up, I'd be very happy indeed.