I don't recall this having had a thread of it's own, at least recently. So - what kind of hair do you prefer and why? Where does it come from? - as in, where on Earth, or what kind or beast, and/or who sells it...
I'll start - I don't have a preference for color, because I've come across hair that I liked of all hues. I'd say black looks the most pro, but that hardly matters!
Usually I find that the finer the hair is the more I like it, in any color; for whatever reason when it comes to "white" hair, I get the feeling like the more yellow a tint it has, the "kinkier" and more brittle it seems to be; I break a lot more hairs plus it doesn't play as smoothly. The best hair I've had was silver/white, very shiny - almost transparent really - very very fine. And that's about all I know.