The black face seems best for videos, you tube, movies, tv shows, pictures. The black lets you focus in on what you are viewing, not the surrounding border. With that said most of the apps have lighter back grounds and integrate best with the white face. So if you mostly e-mail, blog, surf forums, the white face blends better. I have had both in previous iPhones and liked them both.
This time I went with space grey/black face. Using Apple black leather case so entire phone is black. I even loaded up jet black back ground so the apps sit on a totally black front. Can't readily see where screen line is. Whole front face looks like the screen. Black face also hides the front camera, and proximity sensor as well as minimizing the speaker slit.
Only thing I didn't like about the white face was that the screen has a thin black border all way around. That defines the screen size vs the surrounding bezel size. With black face that border is not noticeable. In end just decide, you will like either. We humans tend to validate our own decisions. We like being right so you will surely enjoy whatever you choose.
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