Originally Posted by
GrandReaper
These questions have the inherent question of a built in ambiguity - are you asking about the overall codex (list, story, etc), overall armylist (variety, capability, overall list balance) or "best list using only the most abusive items".
I actually think the answer to all three is SM however, with Chaos being close in terms of abusiveness. However, other than the Chaos list you put forth, everything else pales compared to the variety/power/resiliance of the loyalists. Take Lash out of Chaos and what have you got? Better troops due to Cult troops, but contrary to the writers intentions, 5th edition is NOT about troops.