Yes a very hard question, one for me that is tied to the make and year of the car.
1970 Cuda - Black with a Red interior
1971 Cuda - Red and Red
1972/4 Cuda - Yellow or Green with White interior.
1970 Challenger – Purple with yellow butt stripe with White Interior
1971 Challenger – Winchester Grey with Black interior
1972/74 Challenger……No preference, because I would own one.......