I have tasted a few different white sapote varieties including Redlands and smathers and Excalibur suebelle (not same as California suebelle), as well as some seedlings.
Smathers is an impressively large fruit, but I detected a pine after taste that didn't appeal to me.
Redlands was a decent sized fruit but was just a plain sweet custard flavor, very one dimensional. I had a Redlands tree and it was a vigorous grower but died when i over watered it
The Excalibur suebelle was the one that stood out for both my wife and I. It was a sweet custard flavor with a lemon / citrus taste mixed in. Delicious. The tree seems pretty tough too
You can only purchase this at Excalibur. Other suebelle trees sold elsewhere are typically the true suebelle which is a different tree that has a very hard time surviving our Florida climate.
Brad