Relooking at the question I think that it's confusing. Because different year Mustangs look better in different colors. Red still looks unbelievable on all of them, but on Fox bodies Red (not maroon or burgundy) just doesn't pop the same. And I will say the new Kona Blue (or whatever it is today) is my favorite, but I don't think that it's my favorite for the early years.
So I guess that there are SO many answers to this question.