If the Elin animations weren't so damn awesome, I'd probably be rolling a human female.
Regarding Priest vs Mystic, back when I was playing K-TERA, the general rule was Priest had the better AoE heals + self dispel, and the Mystics had better Party Buffs + HP/MP Orbs. The thing about the Orbs is that they can be scattered all about the battlefield, before you engage, giving hate free heals + the very useful MP replenishment for MP guzzling DPS characters. You basically 'loot', as you walk over them, and instant HP or MP replenishment. Think of it like free potions or heals, during battle, that only mystics can supply. Actual MP or HP potions have a cool-down, so using them is more strategic.
Playing with both, if they knew what they were doing, there were no problems between the two.
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