Probably Tzeentch I think.
A Tzeentch army can still cover all aspects of the game without really having to gimp themselves. An all khornate army will lack magic and Frenzy on some units is just pointless (e.g. a Warshrine doesn't really get much out of an extra attack for 30pts, etc), an all nurgle army pays a ton of points for its Mark, unless facing lots of shooting that relies on BS (as opposed to stonethrowers/cannons) or tons of specifically WS3 opponents, probably won't be worth it, and even then is kinda expensive. Slaanesh is cheap, but also doesn't contribute much, most especially with the 8E BSB and if you aren't facing lots of Fear/Terror causing enemies.
Tzeentch on the other hand is great. Granted there are many units where it's sorta "meh" (knights for instance, although with a Blasted Standard it does make them very hard to kill through shooting), but on Characters with a ward save its amazing, Tzeentch Wizards are very good, and Warriors with a 5+ Parry save are awesome. The mark itself also generally is fairly cheap.
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