Black.
I know some collectors who passed when their 5204P white dial came in -- they opted to wait longer for the black.
I bought
White. Prefer it over the new black. I have also been told white has recently been discontinued.
Yes.
The moon always looks more "pronounced" against a black dial , as it is true with the moon in the night sky.
White dials
on complicated watches. They are so much just easier to read and I would tire of a dark dial on any watch except for the 5711 which the blue dial really works well on that watch.