Ii have one Prof Xtal on order should I use it on the black or the Panda Daytona?
That’s an interesting question. I don’t have a Prof crystal on either of my white dial Daytonas, so I can’t say for sure how much better their dials dial could look with one. And WRT my black dial Daytonas, the Prof crystal is on the one that has a gen dial... So any sort of properly objective comparison is impossible.
IMO the black dials have more elements that “pop” - the glossy black dial surface, the silver chrono rings, and the silver markers, hands etc. against the black dial. All of this - and how good the gen dial looks with the Prof, makes me think the black dial benefits greatly from the Prof. The white dials have less visual contrast, so maybe wouldn’t benefit as much.
But as I write, I’m aware that I prefer the black dial Daytona over the white anyway - so that’s almost certainly influencing my opinion. Therefore my advice would be... put it on your favorite, if you have one.