I give it a tie between Gothmog-Gandalf-Witch King. Gothmog was probably the best fighter. Gandalf had great powers, but was able only to defeat an unamed Balrog and he himself perished for a time. The witch king probably also benefited from combat training while he was living, but later from the powers he recieved from Sauron. I vote for the Balrog captain, Gothmog, who in his early conception was the son of Melko.
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