Feb 13 2015, 5:13am
Sauron: As a maia, one of the ainur, is essentially a primordial spirit of power, and in his case, dark power.
Azog and/or Bolg against anyone of these three Sauron, the Witch King of Angmar, or the Nazgul. Who would win?
Witch-King of Angmar: Sauron's greatest servant, completely unwavering in loyalty due to him being bound by his ring to the One, and by extent Sauron. The Witch-King is unrivaled in Middle Earth by all save the ainur (Olorin, Curunir, Sauron, Tom Bombadil,* etc.) and some of the other Wise such as Galadriel, Elrond and probably Glorfindel as he slew a balrog.
Nazgul: The Nazgul include the Witch-King, his second-in-command Khamul, and 7 other similarly powerful wraiths.
Azog: Large goblin.
Bolg: Large goblin.
With that being said, perhaps another question could be the Nazgul, Azog and Bolg, against Sauron? Obviously this would be impossible according to the Tolkien Mythos as the Nazgul could never betray Sauron, but for speculation's sake. In my opinion it would be Sauron, as no amount of corporeal power could overcome such ethereal grandeur.