I'm definitely going with the taken.
They have so many obnoxious units that just force you behind cover to avoid taking too much damage or be thrown around.
It's not even like they are hard to kill, they just have so many annoying extra abilities.
Particularly hate the hobgoblins and acolytes.
[spoiler]the last one is a joke[/spoiler]
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Definitely Taken, but the Scorn are -blam!-ing close. Those purple totems that shield surrounding Scorn? WHY THE -blam!- DO THEY KEEP SPAWNING THEM RIGHT IN FRONT OF MY EYES TO BLIND ME WITHOUT ACTUALLY SHIELDING ANY SCORN?!?!?!