Always interesting to have a discussion on a favorite fruit, car, politician, etc. Seems like one needs to gather a bunch of scionwood varieties, graft them on a single tree, in a given environment, water accordingly, and sample the fruit. I was fortunate to participate in the collection of Bob Chambers' scionwood extravaganza and have sampled many of the varieties mentioned. Most are grafted on existing trees (they graft as easily as apples, very forgiving). In my opinion most are too sweet (like cherimoyas). I prefer one that has ripened on the tree, has fallen, and is warmed by the sun. It reminds me of custard. Cut into large pieces and dried in my dehydrator, they are an excellent dried fruit which I use when backpacking. One of my trees is over 40 years old (Pike/Vernon/Nettie) and is a true giant. Grafted on a yellow sapote (Casimiroa tetrameria) it is a managable size about the size of a peach tree. I would not plant one near the house/septic tank/walkway. At least they are quite drought resistant.