Chaos all the way, because I'm a massive Tzeentch/Sorceror fanboy. We're better because we embrace Chaos and the Warp; the dogs of that would-be 'god' might think they're bold because they're willing to glass a planet to protect the galaxy from us ... but we will pave Chaos over the ruins of their Empire. (Also because we have b*tchin'-cool colors for our flames. You other races are stuck with lame, normal flame colors! HAH!)
Eldar. You took from us that which was rightfully ours during our hour of weakness, and now we have come to reclaim what was stolen.