Deer vs Fraiser Fir

[Kneejerk Bombas]

My fraiser has sent out 5 or 6 sprouts that are growing vertically around the wound. Should I thin them to one leader now? Any suggestions on which one to pick or just the tallest and strongest looking one? Thanks!

New plantings benifit from as much foliage as they can have, so I'd leave them all and simply make the smallest cuts possible so one leader is taller than the rest. In other words subordinate all but one. There's no need for completely removing them.
You may even want to wait it out and see if the tree picks its own replacement leader. Then if in a few years there is still more than one leader, just snip them back.