I saw this thread recently asking us our least favorite spec so I guess i just wanted to ask the opposite because why not?
It’s a cliché question but I’m genuinely curious!
Personally, I found exactly what I was looking for with Subtlety, so what about you?
Arms and Assassination, usually.
Windwalker in mop-wod was another fun one.
I wish that I could get comfortable on Feral.
What was special about windwalker compared to now?
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Tank: prot paladin
Melee dps: enhance shaman
R dps: demonology warlock
Healer: resto druid
All around is a bit hard for me but I would probably pick demo warlock. It could be better but the spec is really fun to play.
Survival hunter baby, get over it.
Marksmanship Hunter 
I love it, and will play it even when it sucks.
Burn baby burn! 
Mostly tigereye brew. Not having single-target power tied to images was neat, and those were kind of funky to fling around, then just little things like having your interrupt also silence the target if used in front of them, fists stun, fire blossom, etc.
I don’t know. Monk just felt so fresh and new.
Guardian druid because am big bear. And discipline priest because I hate my life.
Frost Mage
Blood Death Knight
MM Hunter (with pet)
Holy Priest
Resto because of all the pretty flowers we use to heal 
Hmmm don’t know tbh but I know my favourite class is Druid love the utility, shapeshifting, transmog, animations and the talent that lets you pick a sorta off spec only thing I hate is that there’s no alternative moonkin forms outside of racial default and the star glyph
Havoc Demon Hunter.
I love zipping around, spamming a bunch of AoE’s.
I also enjoy Windwalker Monk. Fast, mobile specs are fun.
Survival Hunter, prior to Legion, aka RSV.
Sadly that spec was removed in favor of a melee spec.
Fury currently but I’ve always loved elemental
Vengeance (Havoc being a very close second).
Restoration druid, it’s what I first played when I started and it’s what I main to this day, no matter what else I play I always go back to my resto druid.
Frost cause I want others to feel the power of slooooo
I’ve been a BM Hunter since 29 Nov ‘04.