Can't go wrong either way. I was shooting with my Panasonic ZS7 P&S all weekend with great results!
Canon used to dominate SLR market up till few years ago. AF was the best, and glass was top notch. Now Nikon has finally reached that step of going side by side with Canon. This year is going to be huge for both companies.
As I've said before: I've been in your shoes, switched over, and still maintain a somewhat practical Nikon gear. But it has came down to the personal preference and feel for the game. My personal opinion is Canon.
Now, what is yours?