Definately the color - it shows so much more detail to the car. The b/w is nice, but if it is something he would hang and display to show off his car, I would presume he would want to show off the color of the car as well.
if it was my car i would prefer the b&w, has an awsome vintage feel too it. i also like the color on b&w, the full color doesnt really do it for me at that angle
Well, heres an update. I sent the owner of this car all three pictures. He was pleased with all of them. So I asked him what his favorite one was, he said the color one and then the Selective color one. So thanks for all the suggestions.