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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I’ve got a mix of taken and fallen, to be more specific, the taken fallen captain, he teleports every half second and throws mini novabombs and he has a strong overshield, as soon as you see him you gotta use something strong on him or you’re gonna take forever to kill him and you’ll die.