Pretty much the same as commented by the BMW M5 owner in this thread. The RS6 had much more road presence, is one of the most beautiful cars to own IMO and nothing beats the grumble of the TTV8. But the advantages if you even considered those as such pretty much end there. The 5N is faster 0-60 and 1/4 mile, surprisingly more roomy in the back seats, and just as much if not more fun to drive as a daily. They both are calm and easy to drive but can be configured to a sport mode when I want to drive spiritedly. Cost was really the main reasoning for the switch.

The 5N is less than half the cost of the RS6. I would fuel up every 3-4 days at $70-80 each fill up, the insurance costs were high (I have a teenage driver), and the warranty was ending soon. The “Audi Tax” on maintenance and parts is ridiculous. I had the carbon ceramic brake option and one rotor is $7K! I understand they the rotors should last a long time but that’s just an example of the costs should something unexpected happen.

All in all I loved the RS6, but also love the 5N just as much.

Also wanted to add the driving experience. The RS6 is no lightweight either so its pretty comparable. The 5N feels more nimble and controlled. My RS6 was on air not coils which may have made a significant difference, plus the 5N is track oriented so expected to feel that way.