How much dmg would NV do versus DoC on a 6 min fight?
that really depends if you use NV on cd, what you do during NV, and if you stand still spamming DoC, but from what I see DoC does 3-5k with normal use, 10-11k with nothing but wrath spam, and NV does around 3k if maximized for dps, a bit less if you just keep on healing like usual
DoC is more used for very long fights, like Imperator. Its more a talent used when you need to manage your mana.
In my experience, NV is the best talent for almost every fight when used on CD often. I used HoTW for M Butcher, to help out with extra dps (doing a mill damage at the start is incredibly helpful right now, it will be less important once people get more gear). DoC is a MUST for Imperator since its a 10+ minute fight, and mana management is more strict here.