Spear mastery or Polearm master feat for a Barbarian?

First off so no one branches too far out, the character I am making will be a human variant totem barbarian (bear all the way through). Also I will not take any more feats after the one I pick to start with so no polearm/ sentinel comboing. This are character choices that are set in stone for me.

I will either do spear mastery and switch between dual wielding spears and throwing one and then using two hands with the other spear, or I’ll go polearm master and flavor a glaive as a great spear but it will stay a glaive in all but name so no throwing range, no Versatile.

Which one, given these restrictions, is the better choice for damage and battle field control?