Read Wowhead’s guide for Stat priorities, legendaries, artifact progression, relics, and trinkets:
Wowhead Vengeance Stats & Gear
Or read their guide on enchants and consumables:
Wowhead Vengeance Gear Enhancements
Curious why don’t I have stat priorities here?
Stat Effects
Agility
- Defense Healing (through attack power), and dodge.
- Offense Attack power
Haste
- Defense Reduces cooldown on Demon Spikes, Immolation Aura, and Felblade, which translates to more uses of your active mitigation.
- Offense Attack speed, Reduces cooldown on Felblade and Immolation Aura, which translates to more damage from those spells and more Pain for Soul Cleave.
Critical Strike
- Defense Parry (through Riposte), Chance for extra effectiveness of heals
- Offense Chance for extra effectiveness of attacks
Mastery
- Defense Damage reduction on Demon Spikes (through Fel Blood), Healing (through attack power)
- Offense Attack power
Versatility
- Defense Damage reduction and healing
- Offense Pure damage increase
Theorycrafting Notes
- Changed diminishing returns for avoidance: http://us.battle.net/wow/en/forum/topic/20743504316?page=18#351