When it comes down to it, it really has to do with what you prefer working with. Most of the professional photographers I work with, work with Canon. I myself have always worked with Canon(I do have a small portable Samsung). I have had the chance to try out a few different cameras but I find you tend to get more for you buck when purchasing from Canon.
Here are a few shots taken with my Canon. Unfortunately my action shots are at home so I can't directly load them here, but here is the link to the most recent ones I have.
I have used the kodak easy share camera for my trail riding, I have a C-875 Here are a few with it
I just bought a Canon Power shot SX20 My first SLR So far I love it.. Still have alot to learn..I will probably get another for trail riding as my Kodak has decided ro eat up battieries for some reason.