"Black" axanthics, like "red" axanthics, are going to make completely different "snows". Because they are a completely chemically different morphological phenomenon.
But as for the rest, I guess it depends what you mean by "best". Best as in "cleanest", with the least yellow? Or best as in coolest-looking? Because most people look for clean axanthics and snows, but in person it's pretty cool to see that ultra-faded albino look.