I replied in the pole because I wanted to know what everyone else thought. However, as a honest attempt to add to the thread, here is what I think:
Names, eg, corvette, mustang, etc I like, However they have history. Would be pointless to rename a Mustang the 842gt because everyone associates the name with the car.
With a new car, I don't really care as they both do the same thing....allow someone to differentiate between two different cars, easier.
With model lines that have numbers, it is a bit more difficult to keep track of the car you are talking about because names are easier to remember than numbers (unless it's a well known vehicle....F150, etc). Also I think numbers work better when the numbers mean something: two vehicles of the same type (trucks that have different payload ratings, etc) from the same maker that have different abilities (f150 is a quarter ton, a f250 is a half ton, etc).