Being a mod on a cyphotilapia site, imo Moba and Mikula are currently most sought after by people with the money to spend, Moba as the most recognizable name and Mikula have a reputation for being high quality (not that Moba or other Zaires can't be equally high quality, but it depends on the particular fish). Mpimbwes remain popular, also-- not as expensive, reputation as easier to breed than Zaires, reputation as more outgoing typically than Zaires (although this will actually vary with individual fish and setup).
Moba are not really from Moba, but have been collected from different places. Moba itself is not really cyphotilapia habitat, being a sandy beach and not deep, rocky, etc., where you would find fronts, but they were called Moba by the original collector to throw other collectors off where they originally found them. So "Moba" is more a popular name than a single specific location ID.