I've ran this as a Samurai, Red Mage & Warrior and it is definitely easier as a Warrior or any tank I imagine. For sure after clearing each dungeon once, I am only spamming Stone Vigil as it's the only dungeon I can run as a DPS without issue and has high XP. Totorak is also doable as a DPS, but low XP. I might try healer even though I've never healed before, but this might be good practice.