If we're comparing the primal forces that empower both Warriors and Dark Knights, it really is one-sided. While yes, Warriors are capable of intense destruction and possess extremely powerful bodies, they are, at the end of the day, a mere mortal. They are using their own body, and their body's own aether to fight. A Dark Knight in contrast, isn't relying on themselves, they are tapping into the vast wellspring of aether inside of the Abyss to power their abilities, their emotions meanwhile serve as the conduit. We see the full, unbridled strength of a Warrior in their level 50 Job quest, however, we see merely our Esteem, a fraction of ourselves, manifested with the full power of a Dark Knight. The mob known as Esteem can produce gravity wells, ancient dark magic that Diabolos used against us when he had first awakened and by extension, was supremely weakened; our Esteem also conjured Shadow Sprites, a creature we have only ever seen when fighting Ascians; our Esteem also possessed physical abilities that greatly surpassed our own, able to move faster than we could, had more stamina than we do, and could even seemingly teleport instantly across the battlefield. Put simply, it's a case of natural vs. supernatural, and generally, supernatural will win.