Rolling a warlock
would recommend to play both races/probably all genders until you receive the imp - then choose what animations you liked best/and weigh the imp name into the decision and play a bit with the dressing room/look how the different combinations look like in their bis/tier sets.
I dont pick for aesthetics because it doesnt really mean anything in terms of combat. Thats my answer.
Aesthetics because if you're not happy with how your character looks then it really doesnt matter what other benefits it will have in the game.
I'm into PvP and I play UD. Many R13/R14 from private servers were also UD. Consumables are far more important in winning fights than passives. Cannibalize and WotF is also underrated in PvE.
I was a priest back in vanilla and a big reason was shadow form!
Glowing purple was so bad ass and i loved applying a dot to eat away at my opponent, loved shadow and what it brings!
So i guess even in vanilla i was eventually become the master at shadow and DoTs, a Warlock!
I picked undead because of aesthetics, they just look badass even as other classes!
Perfect example is Rogue! They look so deadly when stealth!
Undead just scream, death and decay, which is how i see the Warlock class fantasy as...Orcs look so goofy in robes and in the tier sets!
Just butt ugly lol
Cannibalize and WotF is also underrated in PvE.
What this guy said!
Even with hardness, I cant justify being an orc...I just feel the worst out come where i fight a rogue and i dont resist a single stun...
Also who doesnt want to eat your opponent once you took their SOUL!!!!! BHAAHAAAHHHHAAAA
BUT...an Orc Warlock in Tier 5 in TBC is the best...BEST...looking set on any race for warlock
I chose Orc for my main lock because of the racial trait that gives 25% resistance to stuns. That's a game changer in PvP. Some would argue that the Undead get-out-of fear ability is better, but that has a cooldown... Plus those pesky rogues with their chain stuns can be a real nuisance >_<
So if we're only talking aesthetics...
I've always loved the idea of Orc Warlock. But I hate the aesthetic. In the lore, Guldan is noted as smaller, and skinnier than other orcs. But in WoW, your orc warlock has the same big juicy biceps as a warrior. And they look strange in dresses.
But worst of all, Orcs look very silly on horses/felsteeds.
Undead all the way, it's just fits in so well in my mind.
As the guy above mentioned, orcs don't fit on Felsteed. That's a major factor. I say choose the one with the best casting animation, in your opinion. You'll always be casting stuff no matter what!