See this article that another forum member previously shared.
http://era.daf.qld.gov.au/id/eprint/1653/5/4keycus.pdfIt depends on your soil, climate, scion and rootstocks but in general, Atemoya grafted onto sugar Apple will be slower growing. Atemoya grafted onto Atemoya seedling may be slightly more cold tolerant and slower growing than grafted onto Cherimoya rootstocks.
Cherimoya rootstock will generally give you faster, more vigorous growth.
See page 51-52 on the link provided above for an Annona compatibly table.
I am no annon expert, perhaps Har or Frank can chime in.
Simon