I'd say its Sauron,
Sauron has the Orcs, the Easterlings, Haradims, Umbar, the traitor guy Saruman(his full of :red:) and the Nazgul
while "Lord" Voldemort has only a group of teens,
And if they engage in "man to man" or what combat their is, hmmm, Sauron will win, the guy's a cheater so he will...