Originally Posted by
Filth the Warlock
For destruction the stat priorities change depending on the encounter. There is no "this is better than that" because it changes from single target to multi target. If you have lots of ember generation (aoe) mastery + grimoire of sacrifice. If you have normal single target ember generation crit and grimoire of supremacy.
You cannot go by int>hit>crit>haste>mastery schemes as a warlock, because they are never correct for your gear / encounter. You need to know the mechanics and the reasons behind the changes in the priorities.