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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Taken. Psions multiply like rabbits. Dress teleport more than Nova Warp mains. Vandals are just assholes. Acolytes have those annoying eyes. Goblins grant invincible shields. Hobgoblins have those bolts that fire when hit, which do way more damage than they should sometimes. Knights have their flames, and seem ridiculously strong. Centurions have their darts. Phalanxes have those god damn shields which are basically nothing but an obnoxious ability, which is clearly known by Bungie. Minotaurs are invisible. Ogres knock people back. Captains have those huge disrupting blasts. There’s probably something I’m forgetting, but I’m sure it’s nowhere near as annoying as anything else on this list. Basically every ability was designed as an annoyance.