When I heal I play SCH if I want to do something that needs to be relied on. - the meme skill is actually a super powerful tool in many cases with the speed boost and mitigation. Scholar has a very good kit but it does take a bit of time to get the feel of when to use what.

I play SGE when I am leveling with some friends and I ALWAYS find it lacking. I just don't know what the fudge am I doing wrong but in all situations where if I would take a scholar, I would be able to do a bits of dpsing in between, with SGE I cannot do dpsing even though it should be good enough as a heal, it isnt... Maybe if I reach 90 my opinion will change.

Astro is good heal, good buff to the party. LOTS OF BUTTONS. But I really like the feel of it though. I like it much better than SGE.

WHM: I am leveling it, I cannot really form opinion on the job so far. But I met so many WHM with "interesting" mindsets... this made me reluctant for a long time to even touch this job.