black can be more rewarding, but there is alot of work involved. If your okay accepting you need to wash at least once a week and add some sort or product quick spray type item after words i think your okay with black.
And another side note, conventional wax's and probably everything you buy at walmart will most likely melt off and you will have to use more of a synthentic polish like zaino.
but the black nismo z looks way better than the red one.