[QUOTE=Meow9000;3274650]So, i couldnt find any official DRK post to ask this on so hopefully is quick and easy:

Hi, just to share with you about findings from other dark knights that the reason for being most potent regular combo is due to the total add up of the combos instead of the individual skill itself. show below
Delirium Combo = Hard Slash 150 potency + Syphon Strike 250 potency + Delirium 280 potency = 680 total potency output
Soul Eater Combo = Hard Slash 150 potency + Syphon Strike 250 potency + Soul Eater 260 potency = 660 total potency output (if use with dark arts will be 800 total potency output)
Power Slash Combo = Hard Slash 150 potency + Spinning Slash 220 potency + Power Slash 300 potency = 670 total potency output
Normally I will use delirium combo is due to consistency and mana regeneration with syphon strike unless I need enmity, hope it helps