Anything > 6MH > 623L
Katalina will generally use two cooldowns on most corner combos, 214H and 623H. She can generally keep momentum afterwards using the safe jab setup with 623L, but not having those cooldowns means she can struggle for knockdowns if she gets pushed out of close normal range. 623H can be used at the end of this combo but only if the added damage is needed. Meter cooldown from Rush will heavily nerf the amount of meter she gets from using it.