By price point and picture quality, the GoPro tops Contour. Plus the weather/water proof armour is nice. I've only had it mounted on the headband strapped to my helmet ...
here is one video I took with it. Keep in mind though in that video I didn't realize it was on and thought it was fucked up, and it was my first time trying to do some simple editing.
I haven't tried the Contour but it seems to have a lot more mounting options, especially geared for shooters. The bluetooth connection is especially nice, you can actually see where your camera is pointed while in use then adjust without removing the camera.