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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The taken and it’s not even close. It’s one lost sector in the dreaming city and I swear they just keep splitting into more taken no matter how many I kill then they can teleport. It’s annoying