Heavy Slash Vs Heavy Stab

[Vicious]

I always use Heavy Stab for a 'tough' fight (NMs, etc). Heavy Slash is just too inaccurate to be worth the small amount of damage increase. Not to mention, it takes more stamina. If H.Slash had the same ACC as stab, then yes...I'd use it. But Slash just simply misses too often. No matter if my DEX is 60 or 174.

what type of weapon do you use?