I've got an old model black Macbook. My girlfriend has a white one that I have used often. I like the black one better, for whatever that's worth.
Some things to think about: the black one shows fingerprints and smudges that was annoying for about a month. I bought some cleaner from the apple store and it works great. On the other hand, some of the older white macbook got discolored on the palm rest (in case you are planning on buying used). However, the discoloration issue has been fixed quite some time ago.