Boon prot is widely considered the best single-monk healing machine. It can single-handedly handle healing, protection, condition removal, and hex removal. If you're the only monk in a group (or the group will/might split) boon prot is usually the way to go.
Blessed light prot is really nice for hex/condition removal, but lacks in straight heals over long periods of time. I usually run BL prot when playing PvE with a pug monk partner. I can usually count on the pug to spam random heals with no care for hexes or conditions, and can thus focus most of my energy on keeping the party clean.
I wouldn't recommend RC prot unless you have a 3 monk backline, and require a ton of condition removal and protection. RC prots don't provide much healing, and really don't tend to see much use outside HA.
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