Photographers who use Nikon will recommend Nikon, those who use Canon will recommend Canon. Same advice applies as you would get on here if you were asking about different bikes to buy, go to the shop and handle the cameras in your price range. Pay particular attention to the layout of the controls, which feels the best, most comfortable in your hands, and look at the layout of the menus as one style may appeal to you more than the other.
In terms of quality absolutely no difference when comparing like for like in terms of lens etc. When did you last see a photograph and know instinctively that it had been taken on a Nikon or a Canon?
Enjoy your new camera when you make up your mind..