Draenei Priest
Symbol of hope -Party mana regen 333 mana per tick at lvl 70, Lasts
15 Seconds
Gift of the Naruu -1.5 Second cast heal over time every 3 seconds for 15
seconds.
Inspiring Presence-1% To hit with spells for party.
Shadow Resistance +10 bonus to Shadow Resistance
2.3- Chastise -causes Holy damage and incapacitates the target for 2
seconds.
VS
Night Elf Priest
2.3 -Elune's Grace-reduce chance to be hit by melee and ranged attacks
by 20% for 15 seconds.
2.3 -Starshards -is a Magic effect, lasts 15 seconds, causes damage
every 3 seconds and has a 30 second cooldown
Shadowmeld -Activated Ability outside of Combat that puts the
Night elf into stealth while they remain still.
Quickness -+1% dodge chance
Nature Resistance -Innate +10 Nature resistance
If chastise wasn't in the picture I'd say that draenei seems more pve oriented , and Night elf seems more pvp oriented, but I believe that with it, I'd pick a draenei for sure.