So inthe last 7 days I had two firsts, a custard apple and a cherimoya.
These were store bought so I cant tell what variety or how well picked.
Here is my assessment:
The sugar apple was a total bust. Too seedy for my liking. Also the taste just did not do it for me. I will stay with mangos any day.
The cherimoya was bought at an oriental/international food store. I did my best to pick a ripe one that was a little soft. I don't know if I got it just right but it was a step up over the sugar apple. Bigger fruit, fewer seeds and a more evolved taste. Still though, based on just this one, I still am a mango guy.
I will likely never warm to sugar apple but I will give the cherimoya a few more tries.
By the way I have a ton of fresh sugar apple seed for anyone who wants it. Not for sale, may even pick up the cost of shipping if you are not too far away. No guarantees they will germinate but for free or cost of shipping, may be worth your while. Who knows, orkines-folly may be an all time best several years from now

I also have some cherimoya seeds. Fewer, and I can give some away too. I will save a few to plant.
Full disclosure: in the last two or so months, I bought both cherimoya (from ebay - California) and sugar apple (amazon - looks like from China) seeds and planted them. I will see the sugar apple to fruit and hope to graft on the cherimoya since I understand they don't do (fruit) well in Florida.