Best literal staff?

Generally, people use Recover+ or normal Rehabilitate (+ if you want). Physic+ is pretty useful too if I am remembering right.

Depends on the healers atk score, recover+ with inbue proc is really good healing over 40 hp, then there is physic+ which is good to keep your healer out of attack range if dealing with range units attacking your meat sheild.

If you are specifically looking at Genny, Recover+ is huge. Running her native gravity+ with an attack boon lets her heal 34 HP, and for every 2 attack you increase her, the heal goes up by 1. Attack tactic on a mixed team with her running an attack seal and as an A skill allows her to heal 40 HP, which is enough to either almost max or max out any unit’s HP if they are under 10. Rehabilitate+ is also very good, but it has a niche that allows it to only be maximized at a low HP percentage. The other healing abilities aren’t quite as good in comparison based solely on HP amount they can restore, but are still viable to use.

Martyr+ could also be viable if your Genny takes a hit or two and is barely alive.

Well this is the build of my Genny, Physic plus with Attack +3 A Slot is pretty solid unless you are running a team of armored units.

Imo its physic+, being able to heal at a safe distance beats 10extra hp.