Darth Vader vs Darth Maul vs Darth Bane there can be only two.
Assuming that they all existed at the same time Darth Vader, Darth Maul and Darth Bane get into a Sith lord pissing contest. At the end of the day who is the master, who is the apprentice, and who is worm food. Just in case you only watch the movies and have never read a novel Darth Bane is the Sith Lord responsible for creating the Rule of two. One master one apprentice, one to wield the power, one to crave the power.