I prefer Zero. The reason te say he's 'moody' mainly has to do with his parents and the transformation. I had to deal with the thing with the parents and it's really hard to deal with. it changes your visualizzazioni on the world, making it seem darker overall. te feel like death will creep up on te at any time and wonder why te don't cause it yourself. He's not cold o anything, just upset about the past. So I partially understand what he goes through. When te connect with his story it's eally heartbreaking. I used to prefer Kaname. That was until I realised he could take away the last of Zero's happiness. As long as he doesn't do that, I have no problem.
Of course its Kaname We Amore most. He hides his feelings and wear a mask in front of the world only for the sake of Yuki. His Amore and devotion towards her is so so sooo Romantic! He is like a tragic but stronger protagonist. He is the perfect lover and he is like Oh-so-hot-yet-calm Vampire XOXO <3!!