Kreia once said that the combatants of her generation would be "as children playing with toys" compared to the duelists of the ancient Sith. Because Kreia trained Darth Nihilus, who lest we forget can destroy life/the Force/the universe with his mere presence, she is probably omniscient. Ergo, it's an application of simple logic: Fighters from an earlier generation > fighters from a later generation.
Use your fvcking head next time, please.