I think white as you do not often see sites with black layouts that are not forums or gaming websites etc also white is very easy on the eyes.
People prefer white above a black background. When I visit a website that has a black background, it's usually a hackers website or warez website. So IMO it's white.
There are pros and cons to both options. Having a white background is the norm (heck, Google has a white background). It is the usual color for most professional web pages and usually looks best in most situations. Black backgrounds have a nice touch of 1) being easier on the eyes for long periods of time, and 2) uses less of your energy, and less wear on your computer screen over the lifetime of your monitor.
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