My current thought is to level my first one as a primary raiding character with a Heals Main Spec and minimal DPS off-spec. After I get the first one leveled to 90 and ready with pre-raid gear, I'll immediately shift focus to the other to get him to 90, decked out in PvP blues, with a similar spec setup.
My question is: Which is more viable in MoP PvP? Holy Paladin or Disc Priest?
This answer will help me decide which to focus on for raids and which for PvP.
Thanks for your input, all!