Soldato
Two completely different cars. If you're going for the 8P S3 it's basically a golf so running costs are low and the ability to tune on these are good.
A lot of people have made the transition from an S3 to a B7 RS4 some love it and some don't. Most people complain about the lack of torque though and then the running costs. A new genuine set of front brake discs come to £1000 alone!
Not comparing them at all. I agree, they're completely different cars.
As I said the RS is the wildcard here. Fully aware itll be expensive my concern is whether it'll be unreasonably expensive and troublesome.