Who is the best Chaos God?

[docbungle]

Nurgle. In the end, given enough time, everything dies and decays. Rot for the rot god, disease to the followers!

This and this alone

[Calypso2ts]

I have to go with Slaanesh, he represents the insidious evil that comes bearing gifts that lead to unrecognized corruption. Moreso, he corrupts and twists the spirit of a being until its core values are transformed into depravation!

He is also the most fun at a party I hear.