African Cichlids. Help me decide...?

Coloring is a matter of opinion here honestly. I happen to have some Benga's myself. There in my opinion isn't that much of a drastic difference and I feel these fish when young, can easily be mistaken for each other. Peacocks in this grouping as well usually take a long time for males to display this color. If you are getting a group of them, which is advised if young, keep in mind, that yellow you see is only going to be shown by a male. The females will not display such a color.

Another thing you want to keep in mind is that in a group of these, it's very likely only one male will emerge showing the full color. This is considered to be the dominant male. You may have other males in the group with subdued colorings. The larger the tank, thus more space you have, the better your odds to have more then one male displaying full colors. In a smaller tank, I'd count on only one male emerging out of the group that shows the color.