10 ORC Warlocks or 10 Tauren Druids Boomy

[Ualaa]

I like both compositions, but prefer the Druids.

They can spec as Tank, Heals, Ranged DPS or Melee DPS.
That is flexibility, for PvE type play.

For PvP you can run Boomkin, Feral or Resto.
All three are fairly strong options.
More options is always a bonus.

As Boomkin, you have the Silence.
You can fast cast Wrath or slower cast Starfire (without the spell traveling, so potentially hidden somewhat).
You can apply your dots or spam Moonfire on the run.
The heal, in boomkin form (at the cost of a glyph) is enormous, as that is what Boomkins have lacked in previous expansions.
You have a lot of AoE options, one of the better AoE classes.

Feral is my favorite spec.
Mangle is pretty decent damage; a Mangle based sequence doesn't care about being behind the target.
Rake (combo generating move) and Rip (finishing move) are both dots, which means they ignore armor.
The alpha strike from stealth is quite strong with Ravage.
Leader of the Pack is fairly steady, small heals.
Incarnation is 30 sec (every 3 mins) of very good burst... stealth moves out of stealth, no positional requirements on Ravage...

Resto was surprisingly strong, with five of them.
Rejuvenation > Swiftmend (which procs 1-5x Efflorescense) > Wild Growth... that makes the team very resistant to damage dealt.
Apply 5x Moonfire, 5x Insect Swarm, Tab to the next target...
Refresh AoE heals when necessary; that would be consistent kills on even 8-10 players in AV.
Tree Form allowed for offensive Wrath casting, which was very dominant with five druids.
Tranquility on Round-Robin, with two up at a time, made the entire raid (everyone at Galv/Drek, anyway) almost immune to damage.. I'd cycle through, A... wait half the duration, B, wait half the duration, C... so it was up for quite a while.

Any spec...
Both Flight Form (insta-cast, out of combat) and Aquatic Forms are quite nice.
You can Cat Form > Dash and Travel Form; the new roar for AoE speed boost is an option too, can round-robin that.
Shifting breaks basically any root/snare effect, so powershifting while running away will let you escape almost anything.
Stealth is huge, pick your battles or avoid a choke point.
Battle Rez and Healing Touch (both on Round-Robin) with Nature's Swiftness, are strong options... if you're Feral, mana is largely unimportant, so the glyph for a 100% heal is particularly nice.
I could see Ursol's Vortex being quite useful in 'Flag' type BGs and rather annoying for the other side in general.
Mix 'Mass Entanglement' and 'Typhoon'... root groups of enemies in place, or from stealth knock opponents off of the Bridge in AV, the Lumber Mill in AB, any cliff in EotS... etc.
Nature's Vigil... a percentage of single target damage (heals intelligently, the most hurt friendly target) or a percentage of single target friendly healing (damages the enemy)... again Round-Robin the effect, for supplemental healing when needed (Feral/Boomkin) or for extra pressure applied to enemies while healing allies (Resto)... 1-2 might be enough, but can spam the key and have 25% of the damage (of every toon) constantly healing whatever target they go for... 30 sec, every 3 minutes isn't that long of a cooldown.
Bear Form, even if not Guardian, is decent defenses when they focus on you.