I see there are a few differences of opinion with regards to which class is the better healer. IMO, i'd say niether is better, I have both, Cleric and FvS.
I generally use no pots on either, even if the quest/raid is going to hell in a handcart. People can argue builds, feat selection, pot usage etc etc, what i personally think is, it's not the amount of sp pool, but knowing when to heal and when not to. Generally i'd say it was the player that makes the class.
If you put either class in the hands of a good player, they'll have no problems healing any quest/raid. You put either class in the hands of a not so good a player..........i'll let you decide the outcome.....
It's pretty much horse's for course's imo.
Now, if you'd asked which was more fun.......