Over the years I’ve discussed this umpteen times always lightheartedly you understand, with film I used Canon with Canon glass and loved it, still do, when I went digital I bought a Nikon 5700 as I wouldn’t have to buy lenses. Getting hooked on digital I wanted a SLR, so, big decision my Canon stuff was the golden oldie FD series, so whatever I bought I would need lenses. I shopped around and tried allsorts finally choosing the Nikon D200 it just felt right. So which is best, today with digital I think the biggest decision is more to do with the feel of the camera and whose chip and processor you prefer. Finally relating back to my first comment I have a couple of mates one is all Canon the other Nikon and the both use Sigma glass, my argument being ( more so in the film days) that without the parent lens then they an’t Canon or Nikon they be Sigma .