My favorite is black. I don't really know why, though.
It's everywhere I look, it gives intensity to things, it's a mysterious color. People consider it a bad color-by stereotype, so what? I like seeing it, wearing it, drawing with it, writing with it, etc.
I used to like blue until I was 15, but that preference faded away with my innocence
EDIT: Lol I just saw Mr Cat Dog's reply. SO similar.