Especially after Gracia, EE all the way...
He has the highest casting speed, good buffs (including PoW) and ofc he is a great healer.
Also, don't forget that you can have some important buffs you lack, like acumen, empo and btb from the oly NPC.
Your strategy is simple...
Trance+Mana Burn+Trance+Mana Burn...etc etc
When your opponent runs out of MP, you simply trance him and turn Inquistor on. Then nuke him to death.
Well, you sometimes face problems against classes equiped with Sleep resist armors or buffs, but you can easily win most of them.