For the most part, they have much more dominance compared to silver's or norways, but it's not uncommon for them to have three or 4 stems originating from one parent. Picking one I'd select the right as a leader, but I would just let it play out for now, the die back is kind of doing the subordination cuts for you.
I picked the middle...it is much thicker and already the dominate stem despite the die back. I would reduce the left and right leaders, remove the dead from the central leader and look for and resolve the die back issue (planted too deep?...salt?)
Wait to see if the dieback spreads before further weakening the tree. See if the dieback occurs in the remaining leaders. Don't want to prune the two which could become dominant if the dieback spreads to the one chosen for central leadership.
Good replies so far; n oone right answer. Flare is good, watering is sporadic. I'll take a better look at it tomorrow and then fess up to the way i handled it.
I think it looks too stressed to prune right now. Being young AND showing dieback I think you need to find ways to improve the tree's health and if it stabilizes, then think about formative pruning.
Since the flare looks good I assume no SGR. I'm suspicious the the roots were cut too short during transplant or they are bound with wire/burlap... I can't say WHY I think that, but I do. ...it just has that 'improperly planted look'.
Seems like a fast draining slope so it wouldn't hurt to water more.
I wanna see the results so I'm gonna pick the middle one since they all appear to have dead tips.