I voted Yuki, because he had no votes ;___;
To tell you the truth, I can't chose. Both of them are really interesting and deep as characters, and they balance eachother out.
Think about it, Kyo tries hard to fit it and for people to like him. He yearns for the sort of acceptance and love that Yuki has. And on the flipside, Yuki wants what Kyo (sort of) has, and that's individuality (although unintended) and some sort of seperation from the rest.
They're both jealous of what the other has, and they clash because of it. And even if the rivalry is more one-sided, neither of them would really be able to function on their own.
See, in a way they balance eachother out and push eachother. It's the perfect rivalry/relationship. *nods*
Not to mention, they BOTH have pretty traumatizing pasts. In the looks factor, of course, I STILL can't choose. Kyo is so handsome, and Yuki is just beautiful ^o^