Use the best one, take it to a tire installer. They will know if it's the same size/ diameter as your other tires. Do you have quattro? , if so, the tire diameter has to be very close to the others.

IF the one replacement is smaller in size this wheel will spin faster than the others, your car's computer will think it's slipping and apply the brake to that wheel... not good, that's why for quattro you want all tires the same.
Give us the numbers / size of your original tires and the ones from your garage, lots on this forum will tell you if they are compatable.