Question about Dominant and Recessive white

Hey folks, i have a few questions about dominant and recessive white.

Are the best/cleanest white chickens dominant white or recessive white? I remember Carefoot saying recessive was cleaner or less leaky.

i would assume that both though would work better on a silver base.

My next question is a hypothetical. If you have a dominant white line, and a recessive white line, would you not consider crossing them and getting both dominant and recessive white in one bird? Is that even possible?

Would an silver bird, homozygous for dominant and recessive white be the purest white?