What race...?

Hello guys,

I am thinking about rolling a shaman for PVP. So I wonder if I should go tauren or orc. It is warstomp versus stun reduction - 10 % (Is it worth?) and bloodlust. Which one do you think would be better for PVP (arenas, BGs, world PVP)? And about the spec I plan to go elemental (and enha as a second spec).
At the end I would like to say orc seems a little bit more cool.

A little bit different question, because I don't want to spam the forum, is horde losing in BGs or is it even?

Thank you in advance for your reply.

As elemental I would roll a troll because the extra haste is extremly powerful in pvp.