Hpala or disci (pvp wotlk) ?

I'm thinking to roll a healer for wpvp, 70% bg.s,but i can.t decide If to be a discipline or a holy. Both are good/strong, and i like both tbh, but i want to roll only one. What u think is best option to choose(high end gear) ?

Thanks !

hpala, no discussion

holy pala, no discussion

holy paladin, no discipline

Hpal, but I could have a discussion about it because I have alot of solid reasons as why you should play hpal. >:)