Kinda tough
But I would say the newer car because it will have the best build quality and be the most refined along with a fresh warranty. Base Autopilot is also really good
Have you driven a Performance 3 though? It is the ultimate Model 3.
If you haven't, I wouldn't suggest driving it back to back with a SR+. It will make the SR+ feel incapable. But the SR+ is a great car.
I have one and my Dad has a Performance. I don't like driving my car after driving his lol but if I don't drive his car then I enjoy my car
A Performance with FSD will hold value over time a little better though
Tough one man lol I can't decide. I'd have to see the condition of the used 3 to determine because if the used 3 has poor interior quality I'd probably pass on it if it's beat up