When i bought mine i was fortunate enough to have a choice of two to pick from so i could do a side by side comparison between a red and black one. What swung it for me was:
1. If i'm buying a 'special edition' car i want it to stand out as a special edition, the decals and extra trim on the black one blended in too well with the paintwork. Obviously it's subjective but on the red/white/grey everything is more noticeable, the black one does have a stealthier look about it but that wasn't what i was after. Like i said it's just a personal taste thing.
2. There was a price difference of £2.5k between them, with the black being higher. They were the same spec and year but the black one had done 9k miles and the red 15k, £2.5k seemed a lot for a difference of 6k miles!