I usually let them all grow, you'll get a sturdier trunk and better
root system, also for insurance, you could loose one branch from a deer eating it off etc. Next spring take the best of the 3 as your leader.

Thanks, Konrad, I was assuming it would be better to leave them for a year, and deer are a problem here too, but I protect all the trees. Fred

i remove all but the strongest growing one and keep it as my leader that way it puts all its energy into growing just that one

Here a example with 4 buds, 4 branches, good healing of the
graft in one season...just going into second season.

{{gwi:115176}}