Based on flavor of the varieties I have tried, here is my ranking:
1) Lorito
2) Green Sapote - TREC (close enough to mamey)
3) Pace
4) Pantin (may not have tasted a prime example)
5) Viejo
6) Magana
Sepeda(Cepeda?) Especial is rumored to be excellent.
I have 7 trees in my yard in the ground over 4 years, pantin, pace, lorito, Viejo, Sepeda Especial, and TREC GS. I have only harvested 3 pantin fruit. Lorito has the nicest appearance and is the best grower. Pace and TREC are the slowest. Next year, I will probably harvest around 30 fruit.