Today, I would pick the black dial version 51% vs. 49% for the white dial version.
Since it is so close, I could very easily change my mind over time.
I prefer white one.
I'll go with white too. My OS1 is black, and a white Quai de l'Ile in steel would be a perfect balance.
My OS2 is white, therefore for the S/S QDI I prefer the black dial.
I would go with the black dial. It appears slightly more discreet in my opinion. Both variations are insanely cool.