Stab applies the effects including bleed, but does not get the bonus damage, whenn bleed is triggered, because it can not be bolstered, so bleed might seem the natural choice but doesnt work. Also Might or Fury on hit with Stab is quite fun, when you have another hard hitting finisher in your deck.

Using Stab + any Weapon, which gives you Effects on hit, e.g. Poison or Lightning (there was this sick One Handed Sword Stormbringer?, which you can use twice) and your run is pretty much endless. Having a Stab hit for lets say 8 DMG x12 and triggering the elemental damage every 4 hits just does so much damage. I am only playing with solo hero though, so levels and attributes are on abundance.