Peacocks are more colorful but the females are drab and uncolored. Mbuna have both males and females with color. With careful planning you could have both in your tank. My 125
gal has a mix of peacocks, mbuna and haps. All have been co-exsisting for over 1 1/2 years now. All adults now.
How I went about it...I first decided on the colors I wanted to go with, selected a range of fish that were in the color scheme. Then I researched each fish to make sure it would go with the others. Needless to say, stocking plans were re-arranged more than once.
With proper research you can have the tank with the color and the quantity you are looking for.