Gadgets
What are you referring to when you talk about gadgets? (Not aimed at anyone specific)
Re the Rs4, I got bluetooth, RNS-e 2010+, voice activated stuff, rear parking sensors. Plus the radio is basically double DIN so I change it to some all singing, all dancing touchscreen Pioneer/Alpine/Kenwood. Not sure how easy that is in the newer Audi’s.
Regarding the driving experience
I will preface this with the fact that I think the B8 S4 is a great car (only tested a DSG one). Fast, good handling, comfortable. V6 was meh sounding but that may not be a priority for all.
The E92 M3 was also great to drive. That V8 sounds bonkers and the handling is fantastic. The interior did not befit a car of this class. And fuck me it was a handful in any ice and snow. I would not be able to squeeze into nearly as many gaps in traffic/intersections with as much confidence as the RS4.
Track cars
I think something small, light, and simple to maintain would be more fun than an M3 or RS4 if you are looking for a dedicated track car. I reckon even a 325i E30 would be just the ticket. Maybe I’ll do a couple of gentle track days down the line but I wouldn’t want to be wearing through multiple sets RS4 brake pads and tyres every year.
The RS4
Everything what saki said. I even bought the same colour as him lol. (Or maybe I’m just another fake account)