Wintercontact TS850 on my gla250, amazing grip on soft snow and unploughed roads and cornering on ice, sidewalls don't hold up to well on a huge pothole under the lakeshore, but at least it destroyed the tire not the rim
Sottozero 3, lasted 1 season on a roadster, the rears were toast. I found they slipped way to easily and had to take traction control off to get anywhere, the result of this and not being able to reduce regen which is way more aggressive than other models was bald rear tires in March and replacing them before the winter was over. I threw on my spare rims with the old 'Tesla' approved hancook tires. They are yet to prove themselves as I am comparing them to worn out tires, initial driving showed they were 'adequate' with TC off.
I'm a creature of habit and continental has served me well in terms of grip and durability so I am biased towards them, Pirelli, although I didn't hate them, they took some time to become predictable, and they DID get me home from Cambridge to Toronto in the snowstorm that destroyed so many cars at the beginning of last season so I have to respect that. I would have been more confident if I had Continentals on the car but thats my fault, not the tires.