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/RA is stronger, however /HU still has some things going for it like having decent damage on non-weakpoints.

The PP normal attack boost is not that special for the TMGs, and you do garbage damage on non-weakpoints regardless of what you use. Might as well go for pure damage, although the orbit still has...

Forward s-roll by far
You can move towards a target with it while keeping chain up with the roll attack. Kinda makes the class really easy

My GU buddy is so slow at clearing mobs that it feels like my HU is pretty much soloing still

Limit Break only applies to striking attacks. You mean Tech Arts JA?