I usually get Space Gray because I like how the black bezel gives the illusion of a screen that goes edge-to-edge. But I often use a notes app with a white background - so a white bezel might be nice. If only the devices came in green gold... Then I'd get that, with the white bezel.
When it comes to tech devices, I see many black-only snobs, but I don't see any white-only snobs.
Get the color you like best now. Before you know it, you'll have the opportunity to choose again for next year's model.