African dwarfs would be like the pelvicachromis variants. SA dwarfs you have apistos, checkerboards, some smaller acaras. CA dwarfs...not many (any?) true dwarfs but a few stay smaller (under 4"). It really depends on what you want as far as color, behavior, water requirements (e.g. checkerboards spawn in the wild in PH4 IIRC?, but sometimes do OK in MI water), tankmates, and so on.