I think it comes down to what you plan on doing with your iPad. If you plan on watching movies and television shows, go with a black iPad as it will be less of a distraction with letterbox shows. If you plan on reading with your iPad, go with a white version, as the majority of the reading you will do will be black text on a white background. Having a white bezel makes it slightly easier on the eyes, IMO.
Therefore, I went with a white version as I rarely watch movies on my iPad and do a lot of reading websites and eBooks.
I also got a dark grey polyurethane cover. I just thought it looked best.