Personally, I like "Keeper of the vale" because of Protection from Good and Evil. It's a very pertinent spell to have in the story given that we have already face aberrations, fey, fiends, and undead and I wouldn't be surprised to face more of them in the future (as well as celestials and elementals).
protection from good and evil which is easily acquired elsewhere
Given that this spell only applies to one person and is ideally cast at the beginning of the fight, I like to give that spell to all my characters/companions where I can. Also, given how often we encounters (or might) those types of creature, I don't want to rely on scrolls.
That being said, it would be nice to have more options, as always 😅.
Edit : plus, it doesn't even cost a spell slot, which is huge in my opinion.
