Join Date: Oct 2010
Location: Somewhere, doing something
Warriors of Chaos are immensely hamstrung by a shoot-oriented army, considering they have no shooting of their own. This is especially true with Nurglitch armies, as their mark is useless outside of combat.
Dark Elves, however, are content to outshoot you from across the board with lots and lots of crossbowmen.
I can't think of a single list that could beat both of them, unless you're really planning on bringing a metric buttload of archers yourself.