Tough choice. The coral red seats with AW looks incredible. There was one at the dealer in the showroom when I picked my EB2 up and the red seats look even better in person. Go and look at this color combo and see what you think. The other thing I'd like to know about the red seats is how they wear relative to the black.
EB2 is a great, unique color and you'll never see a lot of them driving around. White cars are a dime a dozen but the red seats make it unique. We spend our time inside the car, not outside so which interior color maskes you "happy"?
You said it was between these two colors but Mineral Gray with the red seats also looks stunning. Good luck.