See a lot of love for Obsidian Mind and a lot of hate for Skull on these forums, especially for PVP. While OM is my go to exotic for Voildwalker in PVE, I love using Skull in the Crucible. Why?
-more super energy from grenade kills (OM's inverse shadow perk is wasted in PVP)
-tougher while Nova bombing
-Siphon powers increased: if you run the right perk set up, you'll notice a difference to your play style and speed.
Sign if you love using the Skull! :) and if so/not, why?
Edit: thanks for all the replies everyone, interesting to hear your preferences in Warlock set ups!
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I prefer Voidfang in Crucible - can't beat spawning with grenade energy/carry more ammo for Hand Cannons. Perks on the skull are useful however you can still do just as much damage without it