I honestly can't decide. There are things I like about both. I have yet to drive one and then immediately get in and drive the other. I think that is what I'm going to have to do to make a final decision. The M3 has grown on me over time.
I've deliberately done LOTS of informal "A-B" testing, driving Model 3 one day, Model S the next, or Model 3 for part of one day and Model S the rest.
My preference is clear ...
............
............
... whichever car I'm currently driving.
Both are such terrific cars that I always think "Yes, this is my choice."
Love Model 3's smaller steering wheel, tighter handling, general in-command feel, cleaner interior, faster MCU, better air vents, (much) better headlights, better range (de facto 335 vs. 265 in my 37K-mile 85D), door pockets, foblessness ... and new car smell.
Love Model S's bigger screen, simpler AP controls, smoother, quieter ride, non-consoled center space, and cavernous capacity.
For me, decision may come down to $$$. I'm an educator ... not wealthy. S85D was worth $100K when there was nothing else like it out there.
Now, however, with rebate/credit help, I can easily turn my 2015 S85D into a brand new, zero-mile, optioned-out 2018 AWD M3 with de facto 70 mile longer range ... at zero cost.
Trading up to a new 110D, even if available before tax credit phase-out begins, would cost me at least $50K net. (In LA County, our near-10% sales tax would wipe out the entire $10K fed/state subsidies.)
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