I always choose my car colour, based on safety and the ability to be SEEN.
Many years ago I had a bright yellow Austin Metro, because at the time the UK Fire Service was thinking of changing from their usual Red, as Yellow showed up better under Sodium streetlights, of course in never happened.
However all my Jazz cars have been Red, internal colour is not really important, other than it should be dark and not show the dirt
I just can't understand why a lot of drivers choose Grey or similar, it must be the worst colour to be seen in poor visibility, when it just blends in with the tarmac!!!