Sch is the greatest dungeon healer of all time. In leveling dungeons, if you know what you're doing, you don't have to hard cast a single GCD heal. Its aoe is instant cast so you can still direct your fairy and aetherflow heal while doing dungeons and your damage reduction heals over time now to help you continue to dps big pulls.

Astro on the other hand feels better when doing trials/raids over dungeons. Their cards keep them busy and their OGCD's are plentiful so we're always doing something during all of our malefic casts. But not being able to OGCD weave during gravity spam (outside of light speed) makes sch feel a lot better during dungeons. Astro's new 80 ability also feels like it only really shines if things are going terrible or your other healer is dead, since utilizing it requires hard casting heals which everyone is trying to avoid as much as possible. Though it does just more use in Eden right now. Ast is still a good job but its ease of use and the way it feels is a little rougher than scholar. Sch flows really well and doesn't struggle with much at all, Ast just has a couple hiccups