Vitality/Bleed Pet Ritualist: Primal Bond or Master of Death?

Which is better in your opinion?

My devo setup:
Skeletons - Rend
Devouring Swarm - Will of Rattosh
Ravenous Earth - Howl of Mogdrogen

Depends if u need OA or flat damage / Crit damage on pets
Is your pet OA high enough? so go for Primal, if not… master