I'm fairly new to either, having only flown NVG's for the last two years. I flew green first, then switched companies and now fly whites. I think I actually prefer the greens, but I think that the whites that we have are of a higher quality, are taken better care of, and etc. Only a marginal preference, though. (I'd liken it to asking an Amish buggy driver "Do you want to drive the 10 year old Porsche or the 5 year old BMW?" Anything but the horse!)
I do find that I flew more with the greens down. Now, around city lights, I fly unaided a lot more as I find the whites to be a bit harsher. Still, over vast nothingness, I like having anything that helps my stupid human eyeballs see things that I thought weren't there.