For trash pulls, I often stay in Defiance. Unless for some reason fighting stuff much weaker than me.

However, Deliverance comes in very handy on bosses. A fun tactic is to start in Defiance, Maim, Unchained, Berzerk, Storm's Eye, then a couple enmity combos. That should be all the agro you need, so switch to Deliverance and BB/SE/Fracture/Fell Cleave for rest of the fight.

Can rotate defensive cooldowns ( assuming not a special reason to save them). Just 1 or 2 up at all times while in Deliverance: veng alone, thrill+conv, raw intuition+awareness, foresight somewhere. You will run out at some point, so be ready to Defiance+Equilibruim.