Which camera brand is better. Canon, nikon, panasonic or sonic?

What makes it better?

It's between Canon and NIKON for me

NIKON d700 and Canon 7d are the best cameras out there in my opinion… If you want to spend less money NIKON d3100 is pretty good

Canon and Nikon dominate a large part of the camera market, but Panasonic and Sony (I think that's what you meant instead of Sonic) have some good camera models out there too.

Canon & Nikon are the best brands. You need to find a model that is personally suited to your handling, viewing, and comfort. I have been a Canon man all my life and they have served me well, and the same can be said for the DSLR's made by Nikon, by Nikon owners.