In the trials of around 25 varieties at Kamerunga in Cairns one variety stood out in terms of productivity, lack of grit , flavour and also for multiple crops each year. No indian variety stacked up, sawo manila was ok, but varieties like tropical, ponderosa, brown sugar and old common ones faired poorly. That variety was krasuey. One particular trial included the following BKD 110, Brown Sugar, C54, C55, C58, Foster, H C Tan, Kai Hahn, Krasuey, Kulbaba, Lamao, Makok, Makok See Gaa, Martin, Mead, Modella, Pineras, Ponderosa, Prolific, Sawo Manila, Tikal and Tropical. I am sure some of the newer Floridian and Mexican types would fair better.