Best at what. You cant measure Best so all answers will be subjective.
I. Best on a proud to own basis - My GSM Flamingo.
2. Best at mpg - Trojan 3 wheeler did 80+ to the gallon
3. Best pose machine - Most of my convertible Sports cars, I still have an SLK which I love.
4. Best Handling - One of several Lotus cars they were subline.
5. Best for nearly killing you- My modified Lotus Sunbeam whoever though putting a Lotus Esprit engine in a Talbot Horizon was Best at being a Chimp.
6. Best ( Fondly) remembered - My 1960 850 Mini back in the early 60's.
7. Best at going fast- My Cossie will always hold that.
8. Best at being a great drivers car - My Audi Sport never should have sold it.
9. Best at going wrong & being a total pile of poo- Once owned a real dog of a Fiat 124.
Asked to pick one best it would be the White 1960 850 Mini life cant get much better than being one of very few teenagers to own a car back then & having a head start in the 'pulling' stakes. I was reading about what went on it in my wifes Diary from back in the day & we had a chuckle. Yep! that was the Best.