Ruby Red is very nice. It’s not too bright for me like Race Red but still has pop and explodes in certain lighting, and it’s not too dark like maroon. My only dislike with Ruby Red is that it doesn’t contrast very well with the tail lamps. The tail lamps are one of the Mustang’s signature looks...
Black looks better in natural lighting and in person. The body lines look more hidden when under a lot of spotlights because you see a lot of bright light reflections on the car.
Black gets dirty easier than other colors and dirty spots are more visible but when it's clean it's the best looking...