Best car ever made in my opinion comes down to the 1950's Austin Mini with how the engine was positioned and front wheel drive, its how every car was built on but in different shapes, a blueprint as such. It was also a very affordable small car from a traveller to the sportier versions.
The original VW Beetle, it made things in level of engineering for future cars to come, even if a designer from Porsche helped build the chasis for it.
The 1st Porsche 911, seriously every model of Porsche since has been based on that one. It made records for racing cars around the world and was the higher class working man and also a bench mark.
But if I was to pick any car, lancia delta integrale... Just man p**n all over....