I have experimented with both Canon and Nikon and personally I settled on Canon as my choice. I found that generally Canon had a slightly warmer color cast compared to the Nikon, taking anything away from Nikon. I ten to do lot if sunrise/sunset shooting and landscapes so I tend to prefer warmer colors anyway. Another reason I chose canon was the use interface. Felt a little more at home navigating the Canon menus compared to the Nikon, although I was mostly using a entry level Nikon d3000 which ha very limited shortcuts and control buttons externally. I think that the lo light capabilities of the Nikon are pretty awesome, as I'm sure some upper level Canons are . The included EOS Utility software is a free bit of extra thrown in with. Canon which allows you to completely control you DSLR remotely via you computer, which is BADA$@!! but didn't really weigh in on my decision at the time. I have found that accessories for the Nikon cameras are typically a bit Kessler expensive than Canon, which sucks, but oh well. There is a plethora of lenses available for both platforms, as well as several others for that matter so that doesn't seem to be an issue for too many people unmaking their decision anymore. Although with Canon, unless you buy an L series lens, you are not getting a lens hood in the box, which is a little crappy I think. They should take a page from literally every other lens manufacturer and include a lens hood.
I would really recommend spending some time with each and see what features you like and dislike about both of them, as well as other manufactures, before you make a final decision...if you are still deciding anyway. Some people prefer the feel and ergonomics of a particular model of a particular brand. And don't be afraid to shop used gear. I would try to get used gear from a good camera shop though ad they are typically yuck t tell you exactly what condition the product is in ...B&H photo, Adorama, TriStateCamera, the lit goes on and on for online suppliers, just google used DSLR
Anyway I hope my response hasn't angered too many user with it's tardiness, but I thought I would chime in and possible give you even more mixed feelings about what to shop for.
Oh and by the way, once you get a DSLR, you will spend countless hours of your life pining over gear and geeking out over technology!
Good Luck!
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