I am debating between a used CPO dual motor model S and a brand new 3. I like the size of the S for comfort since I'm 6'2" but the 3 seems pretty nimble which is nice. Will all years of the S have FSD capability like the 3 at some future date? Guessing the S rides smoother and quieter? Are the electric motors a concern on some years or suspension? Looking to trade in my 2017 Audi A4 quattro. It has had some warranty issues and I'm a little concerned about it's long term viability.