Canon DSLR or Nikon DSLR?

I have a Nikon DSLR currently (D3100) and I kind of want to switch over to a Canon. Which company is better? And what are advantages/disadvantages of both?

Canon and Nikon both make great cameras. Since you already own a Nikon, switching to Canon would be a total waste of money.

For what it costs to make the change, you may want to take a hard look at the D7000, one of the best "semi-pro" cameras right now

If you are really asking which company is the best, you really have not been doing your research.

I'll make this very simple. If you can't get great photos from the D3100, changing to a different brand won't make a difference.

It is really a personal preference. Both are great companies with excellent products. The 3100 is a nice entry level camera and I don't see a reason to switch. I prefer canon for a few personal reasons, but considered switching to Nikon last year. The cost for me was too much as I already have a nice lens collection. The biggest difference is the image processing between the two brands. Each has a distinct look. Both of are excellent quality and like I said a matter of taste.