Is the woman who wears a niqab of colors less rewarded than she who wears black?

The black color in women's clothing has no superiority over other colors. The condition for a Muslim woman's attire is that it should be covering, not revealing the body's shape, nor adorned in a way that attracts attention, based on the Almighty's saying: (And not expose their adornment). If black is more effective in covering and further removed from suspicion and manifestations of adornment when going out or when non-mahram men are present, then it has a merit in this case.