NDM#4, Pickering, Julie, Dwarf Hawaiian have grown slow and compact for me. Carrie and Neelam have grown horizontal than vertically up but they are not slow growers and in no time they have formed a 10-12ft wide bush, 8ft tall without much pruning from my side. Similarly if you like Indian mango flavors then Amrapali and Jehangir have grown slow for me with short internodes. Imam pasand and Sonpari are not slow growers nor are they horizontal growers, their branches are pretty upright at least the ones i grow. Mallika is not a horizontal grower, it shoots quite long vertical shoots but good thing is that it has distinct flush times so it is not flushing all the time and bears heavy fruits which kind of weigh the branches down and naturally make the branches horizontally trained.
My Rosigold was not a compact grower, and the trees i have seen seem to grow vertically but have less vigorous growth. Cogshall seems to have short internodes and dense branching so yes it can be kept compact. I had to topwork mine as there are better tasting mangoes and i had limited space.
Honey Kiss has grown slow as well. Less frequent flushes compared to Super Julie or Peach Cobbler or Orange sherbet that i see flushing all the time, Honey Kiss flushes 2-3 times a tear for me hence it seems it is growing slow but this may change as the tree ages. Little gem i have seen growing at two different home garden, Coral springs and next at Cape Coral in TonyinCC's garden , both trees looked compact and bushy, not growing sideways but bushy like a drumstick.
If you have 15ft diameter to play with, then you can fit pretty much get any tree that is not extremely vigorous grower and train to keep it compact.
