Switched from a Canon 50D to Nikon D7000 two years ago and havn't looked back.
Two reasons for the switch - was constantly have to fix white balance on the Canon. Canon was great for still people/objects but for sport nothing special.
My first sport image from the Nikon was my best in the last 5 years, and it is now a very rare thing for me to mess with the white balance.
Anyway you use what works for you
JW.