Nikon and Canon have had a longstanding rivalry, and there is no outstanding evidence to suggest that one has a significant advantage over the other. I started with Canon because that's what my mentor used. Now that I've developed my collection of lenses, it would take a lot to get me to switch over because only Canon lenses work with Canon bodies, and vice versa. There has been some recent debate about the Canon/Nikon AF system, which is worth looking into before you invent in a brand.