Elemental shaman or balance druid or feral druid for PvP?wow?

so far ive made many toons and out of all of them i really enjoyed druids and shamans. Ive seen many players using a druids and a few shamans in warsong gaultch (sorry for the spelling). Ive got a 32 shaman and a 19 druid, all my friends that play wow say to roll as a druid but i dont really see druid doing high dps compared to elemental shamans. so what should i roll with, a druid or a shaman.