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....

 
				 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		