I have a nectarine tree that someone grew from seed, apparently a reliable variety. It got eaten by deer a few times, resulting in growing in a bushy form, currently 4 feet tall. Does anyone have any experience growing fruittrees as a bush (with many main branches coming out of the main trunk about 1 foot up), or should I just cut away all but one of the main trunks?
If you want it to end up a normal shaped tree, I'd go for pruning off the all but the center stalk. Personally, I'd think a low growing one is easier to harvest off of, for you and the deer (take that into consideration! It's easier to fence the deer out if the tree is short though.)
If it were me, I'd let it stay as is, maybe shape it a bit as it grows.