The Cow
Forgive the transmog set - battle.net hasn't caught up with the gear set I'm currently in.
I've found that Stamina/Critical Strike builds are the ones that work best for me.
Haste works best during fights in which there are heavy amounts of damage going out on multiple targets. I save
Lifeblood for situations such as these, which turns Regrowth into a manageable 1.4 second cast time. Learn to
pre-cast your heals based on heavy damage dealing enemies' focus target, and you can make do with replacing the haste for stamina.
I take
Critical Strike because Restoration Druids rely on Regrowth criticals to keep targets up under heavy pressure. Since the base-line healing for Regrowth is extremely low relative to other healers' spells, utilizing the base 60% critical strike chance to get as close to 100% as possible is a must. I've found that
15% Critical Strike chance is a good threshold to aim for.
Stamina is an obvious choice for any healer, but I think on Restoration Druids it is particularly important. For starters, being
over 2k health in a battleground means that it will be extremely unlikely that you will be able to be one shot. You'll be reaching the point where most 24 Beserker buffed rogues won't be able to one shot Ambush, and most Spriests won't be able to finish you without a double critical combo.
One argument against Stamina for healers is that oftentimes it doesn't make a difference, since the extremely high damage DPS will be able to stay on you long enough to finish regardless of your health bar. But Druids have some of the
best escapes in the game.
Wild Charge / Displacer Beast are awesome re-positioning tools that allow you to stay up through even level 24 damage. Maximizing your health synchronizes perfectly with these escapes, since you're going to need a large health pool to even begin to use your escapes.
Currently my druid in this set sits at 2279 base health in battlegrounds, 160 spell power, and 17% critical strike.
For Arenas, depending on my comp / the comp that I'm facing, I switch out haste items. But in a pvp medium where we face gigantically overpowering damage, stamina will be your best option.