I think the difference is that 'Disciple of Divine' Wrath lacks the line "You do not regain the use of the power if the target drops to 0 hit points." Ideally with Disciple of divine as long as you kill your enmity target before it expires...you get it back. So if you use it for a killing blow or on a minion....you have multiple uses of it. With Hero of faith, you can't recharge it.
For the record, i've been using disciple of divine feat for a long time, and this has yet to happen....
For the record, i've been using disciple of divine feat for a long time, and this has yet to happen....