Which PvP set?Follow

My resto shaman wants to PvP. And while it can be more fun to PvP as ele and blow things up, I think it'd be even more fun to heal through that lava burst and watch whoever I've shielded tear the enemy up. However, as a relic of the pre-resil buff, most of my PvP gear is elemental because healing back at WotLK release really sucked and I was pew-pewing. I'm wondering if restos find the mp5 on the resto gear useful in bgs (since I don't really arena) or whether I should stick with the crit-heavy ele set. The 4-set bonus is the same on each, of course.