Both are useful. Bishop is better in pass pvp/siege and RBs and EE is useful most for 1v1 preparation of a mage for nuke (I talk about PoW)

Just continue your Bishop(i can say my favourite char). After all he learns that super skill "celestial shield" which gives ultimate defense effect effect for 10 sec and u can also run. It`s a real life-saver

the best buff for all mystic nukers <-- yes for nuker but what about DD?

one of my friend play bishop she doing her job well (although sometime she sleep lol) but from time to time our party can survive because of her.

if you looking for no1 healer in game go to bishop which most skill is for healing

EE is half buffer healer but bishop is devoted only to healing...so continue being a bishop