I went for white this time round for a number of reasons, partly as a change from black, partly because I love unfinished aluminium (like the Macs) and also because of all the scuffing stuff.
But when I think about it, I actually think a worn out black iPhone 5 would look seriously badass. It is, however, hard getting through the 'honeymoon' period of a new phone; people want them to be perfect at first, but when you eventually push through to the worn-in look, it looks awesome as well.
Resale value, which I know is important to many here, does suffer, of course. That's the main downside of the scuffing thing, in my opinion.
Anyway, what I'm saying is that I think both colours are great in their own ways.