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Both!
Probably doesn't help but I'm duo-leveling a disc/holy and a shadow priest as my first jump into multi-boxing. I actually got a few shadow talents for both so they could both mind flay. I find in an Oh CRAP! kind of situation, the disc/holy priest can survive better and live to rez the poor dead SP. Of course I'm not high enough yet to get the damage reduction of shadowform, so that may change.
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If you priest well geared with good healing you sould have 800 plus normal damage at 70 and can solo and pvp with that I love to mind control a mob and have others kill it or have it kill others , great fun in pvp
