I'm just going too give some information on the Abiu relatives. Pouteria Durlandii and P. Reticulata are both dioecious with little flesh. I'm not
sure if the Bellamy giant "Sul de Bahia" Durlandii is properly labeled and dioecious or not, but the seed to flesh ratio looks pretty good.
P. microstrigosa appears to have very little flesh.
I really am not sure about P. Venosa. It has a good width of 5-8cm. I'm not sure about the seed to flesh ratio, but I'm let to believe there
isn't too much flesh. I have also been lead to believe that it isn't anything too exciting about Pouteria Venosa.
Pouteria Procera (Macarandilba) and P. Elegans (Camamuri) look okay with an okay seed to flesh ratio. I could be convinced to buy some
seeds, but I just think there are better, more exciting species you could get.
Pouteria sp. Hairy, Pouteria Tuberculata, and Pouteria Gallifructa all are closely related, however P. sp. Hairy is said to have the most flesh,
although all these 3 don't have too much flesh. I've seen pictures of the trees, they all kind of look like yellow rambutans. Very cool!
Pouteria Bullata sounds tasty and looks tasty, and has a good seed to flesh ratio, however the is not much information on it. It appears quite
similar to Pouteria Torta subsp. Torta, which has a great taste and a great seed to flesh ratio too. Just don't get that confused with Pouteria
Torta subsp. Glabra, which looks incredible, and is talked about a reasonable bit. These 3 are on my list, for sure.
Edit: I personally think that some of these are just to small to bother about - P. Reticulata, Normal P. Durlandii, P. Microstringosa and P. Elegans. And I think in regards to the 3 'rambutan pouterias', I'd only get P. sp. Hairy - all 3 would be a poor use of space.