i have a white, but i really didn't have much say in which i got, as i did a straight trade for it (with my old PB).
that said, i had gone into the stores and looked at both, and although i liked the black, it looked really grimey and dirty in the stores (from all the oils on people's hands), and that really turned me off. the white gets the scratches, but they're really subtle and only noticable at the right angle.
plus, i still love the way the white stands out against the sea of black laptops that are out there.