What is the be Healer?

[Fevelle]

The best, as a WHM main I am, is the Scholar. Good at single target heal, good at mitigation, good at HoT (Fey Light + Rouse + Whispering Dawn), best instant heals and best MP management in-game, highest healer DPS capabilities. SCH is a beast if played right.

The point of being the best is NOT being needed, it's the capabilities of the class. Of course there are some types of content where they are more or less capable of doing all their capabilities permit them, but they're still there.

So in-game, Scholar is probably the stronger.
Lorewise WHM is the strongest.