Fave: Earthly Star (AST)
It's multi-function! It's stronk (the heals!)! It's flexible! It's a dome! But most importantly...it's PRETTY!!! Asylum (WHM) and Sacred Soil (SCH) is probably sitting on the same top spot but I picked Earthly Star for their unique use.

Least: Fey Illumination/Dissipation (SCH)
Okay I cheated, it's two. But they are here for same reason: they buff none of my healing abilities!! Just my healing spells, whyyyy?!