hey guys I have a 85 warlock and i'm thinking about mastering cloth-wearer classes.(either priest or mage) both classes attract me cuz ive been pwned by frost mages countless times, while priest can heal themselves and can easily enter instances as a healer. i heard that SPriest are strong PvP class as well. I wanna play mainly in PvP style.

Qustions
1. Which class is more likely to win in a 1 vs 1 pvp- SPriest or Frost Mage?
2. which class is more popular in raids?
3. is combination of SPriest and FMage good arenas?
4. is priest healing easy?
5. which is more fun?