Sorry my bad on mobile cannot edit the post sch adol is not 3x cheaper was my mistake

But scholar got the best kit out of the 3 healers to deal with raid wide damage by reducing the total incoming dmg by clever usage of skills

Whm is the best healer to keep raid alive and offer strong dps when not healing

Ast provides raid with card buffs have decent heals to keep the raid healthy

As a healer technically u would want all 3 healers maxed out and change base upon which is more useful for the current boss

Whm = would need if u need a lot of healing within the raid and can deal with most situations flawlessly

Sch = would need if u need a lot of damage prevention or if mechanics require split healing (double prey for example)

Ast = would need if u need to provide raid with more dps through cards or split healing through clever use of synasty

each healer have a roll which depends on the mechanics at hand which players neglect