Ignore investment potential (vastly overrated; and in truth, probably non-existent for this piece).
Ignore what others think you should do.
Go with whatever instills the strongest desire.
And now, after that advice, I will, ironically, tell you my preference...
...which is strongly for the blue dial. It perfectly flows with the subtle elegance of the Nautilus.
The white dial "pops" and is more instantly noticeable, which some may fine attractive, but which I find too stark and bold, defeating that subtle elegance I like so much about the classic Nautilus.
Cheers,
John