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I personally use Nikon, but I've heard the Canon sensors bring in more light and are more sensitive than the Nikon CCD's, so that might be a plus for you. Lenses are priced around the same for each company besides the high end telephoto's because nobody but NASA buys anything more than a 300 F2.8 VR.
You wont have to worry about edge darkness & vignetting as most of the DSLR's on the market use only the center of the lens anyways.
Go to the store, try them out, see what performs better, which brand you like better as you'll probably use it for things other than astrophotography also.
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