Do you have an existing SLR system, or will this be your first SLR? Do you have a range of lenses suitable for either camera? I have neither camera, but I am sure that they will both do the job admirably and that on balance their relative strengths or weaknesses will be far less important than the person behind the camera. Most of the questions you ask would be more affected by lenses and post production processing than by the body. Assuming that you are asking the question because you are thinking of buying one or other, and not just as a discussion point, I suggest you go and get a feel for both cameras at a store. I have used Canon for a number of years but picked up a D300 two years ago. It was a lovely camera, but I just did not want to swap lens systems, and the EOS control layout just seems like second nature to me now.
Jim
