Given a choice between having the massive AoE aggro magnet that is the "Angel of Vengance" aura that is running constantly; or being able to use almost continually a HP healing Aura, and also have the ability to regen SP for the blue-bar users. I would say the cleric has the far better class abilities.
I played FvS well before the Angel of Vengance line was released. It was the Leap of Faith that made me buy the class; not because of my abilities as a seer to forsee the Angel of Vengace line coming two years after the FvS release and wanting to get in on the ground floor for it.
The natural elemental resistances of FvS are basically obsolete now with ship buffs so easily available.
The Additional SP is a nice perk, but the Sorc get the same thing; and they are a free class not a pay one like FvS.
FvS have a 3-day cool-down wait each time you swap a single spell, also not so awesome on a pay class. Serverly limiting the FvS class versitility in spell casting as compared to the other, and free, healing class Cleric, who can swap their spells at will, and more then just one at a time.
Leap of faith is/was the defining feature and perf of the FvS class. And it is also why a lot of people decided to pay for it, not for the bad enhancements and lack of ability to change out spells.