Check the potency on the description. Physic is the same as a cure1 but adlo is not the same potency as a cure2 because of the shield. Lustrate is more akin to cure2 but use aetherfow. Succor think hace the same potency of a medica2 but intead of a regen effect it have galvanize. The instan AoE cure is like a medica1. You also have a fairy constantly healing and buffing for free. That more or less the comparison SCH vs WHM, as for AST with how the Noct stance work 'im not sure how the conventions are but they are very close.