People will always battle the Nikon/Canon fight. I am NIKON gal. But it really is like saying BMW or mercedes. They are BOTH fantastic cameras. The sony is building a nice brand too ( it was the old Minolta range)
If you want to compare cameras and what they can do and see reviews from the man(woman) in the street, rather than a salesman that may be getting a higher commission on one or other brand go to
www.dpreview.com
Good luck with your choice.