Tanks using their enmity combo while being OT

[Crater]

So basically throttle back their own dps so that the less capable tank can tank. The sheer number of ogcd's and constant buffs from using Dark Arts liberally should more than make up the difference for a dark knight, and Paladin has 3 moves in their standard dps rotation that cause increased enmity. I'm legit not seeing the issue here.

If you had two skills that shared the same cooldown, and one did 20 potency and the other did 50, with no additional effects, which one would you use?