Well none of them beat Calm Mind. I think Breeze Assassiniation Sword is better just because it's better than Breeze Flash in Nine Tails. I guess in Arena (if you don't want to run Calm Mind for whatever reason) Breeze Flash is better since you want the high chance to knockdown. If I want to go p1 Lighting Main blitz in SWB I'd use Breeze Assassination sword instead since you will most likely crit and combo anyways plus you will run the Demon Passive with it so you will just gobble up any clones anyways.