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I got a white and just got my Macally black leather case for it. Now it's Sexy... and I don't have to really worry about it getting scratched... I also like the leather look on it. Makes it a little thicker but I feel more safe carrying it around to places.

Though I've seen the Macally on Black Macbooks before in pics and that looks pretty hot too. I just like the while keyboard though. Makes it so you can see what needs cleaning.
 
I've never really closely compared the two, but our church (until recently) had a white iBook. It was about 3 years old and there was a bit of yellow discoloration to it. It was most noticeable with the keyboard, which is completely different on the MacBooks. It was also there with the top casing.

I went with the black because I avoid white on all major purchases just because things show up on white much easier. However, if money was an issue I would have gone with white.
 
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