What new Race?

[Whowantstoknow]

So, I am doing the alliance/horde thing (yes im spending the money ;0), I am a shaman 4 box team, mainly pvp but love to pve to (naxx, heroics all that stuff), What race should i be on horde for the best racials!,

Orc,
Cow
Troll

Orc has great racials for both PvP and PvE so would be my choice
Troll is great for PvE
Cow is good for PvP