It is entirely dependent on which exotic helmet you have If you have Obsidian Mind then Voidwalker If you have Apotheosis Veil then Sunsinger If you have Light Beyond Nemesis then whichever subclass you prefer, because more orbs means fewer deaths for everyone Now if you have a Deathsinger's Gaze with the Infusion ability then it opens the door to other exotics and ability synergies: If you have Claws of Ahamkara and selected Lifesteal then Voidwalker If you have Heart of the Praxic Fire and selected Song of Flame then Sunsinger In both cases you should already have Lifesteal or Song of Flame in a raid to begin with; the former heals you with melee ability kills and the latter allows allies to shield/heal themselves with their own special melee abilities dramatically more often.