Stat Priorities
Raiding Stat Ranking
For Raiding: Item level > Haste > Mastery > Crit >= Vers
In raids, a good amount of haste will reduce the global cooldown (GCD), allowing you to apply more HoTs faster on targets while greatly improving your HoTs ticking rate (more ticks means more total healing over the same duration) and reducing cast times.
Your mastery will, too, have a great impact, thanks to the multiple stacks of it you can provide to people through all your HoTs between Rejuvenation, Germination, Regrowth, Wild Growth & Lifebloom (even though this one will only be on one target).
Mastery generally holds high value, particularly in any group-based content.
Mythic+ Stat Ranking
For Mythic+: Item level > Haste > Mastery > Versa > Crit
Item level remains your top priority. For healing, Haste and Mastery stand out as the strongest stats by a significant margin early in the expansion.
If you really need more healing throughput to grasp the spec during smaller keys, for instance, you can add some mastery to be extra safe, though you should consider swapping stats to Haste > versatility to improve your DPS & survivability for high keystones dungeons and embrace cat-weaving.
Stat Outline
Intellect: Increases your spell power, which will boost your overall throughput.
Haste: Increases attack speed, spell casting speed, and energy regeneration.
Mastery: (Mastery: Harmony) Your healing is increased by a percentage for each of your Restoration heal over time effects on the target.
Critical Strike: Chance for extra effectiveness on attacks and heals.
Versatility: Increases damage and healing done by a percentage, while decreasing damage taken.
Races
If you’re Horde, Troll will be the best-suited pick, thanks to Berserking, giving you 10% haste, Tauren for his AoE Stun Racial War Stomp, and extra base health racial Endurance.
If you’re Alliance, Night Elf will be the most common pick, not offering that much throughput, but mostly utility via Shadowmeld. In M+, especially if you’re pushing keys, this spell can be extremely good, allowing you to cancel some targeted mechanics, or to redirect them on someone else if you don’t have any defensive abilities to handle them/want them to go on a class with an immunity.
Enchants
Helm: Enchant Helm - Empowered Hex of Leeching
Shoulders: Enchant Shoulders - Silvermoon's Mending
Chest: Enchant Chest - Mark of the Worldsoul
Boots: Enchant Boots - Shaladrassil's Roots
Legs: Sunfire Silk Spellthread
Rings: Enchant Ring - Silvermoon's Alacrity (Raid) / Enchant Ring - Silvermoon's Tenacity (M+)
Weapon: Enchant Weapon - Acuity of the Ren'dorei
Gems
Unique Gems: Indecipherable Eversong Diamond
Regular Gems: Flawless Masterful Peridot / Flawless Quick Amethyst
Consumables
Food: Blooming Feast / Harandar Celebration
Phials: Flask of the Blood Knights
Potions: Lightfused Mana Potion / Light's Potential
Health Potions: Silvermoon Health Potion
Weapon Oil: Thalassian Phoenix Oil