Both have pros and cons.
Contour is cool cause you can adjust the direction it shoots with out remounting and it has a lovely little laser to show you where it is pointed. It also has one giant slide button for recording or not recording. Kinda hard to mess that one up. You can get plenty of mounts for it. You can mount it ontop of the helmet or on the goggle strap. The reason for the less wide angle is cause it puts out a better image for distance... like if you were sailing or sky diving or whatever the image still is relatively undistorted.
Con's... its mic location pics up a bit more noise. I've seen some problems with the format, last I checked it was a format that didn't come standard on PC's and you needed a codec for it. This very well may have changede. There is no chest mount for it so for non helmet/goggle wearing sports, it could be a bit weird to figure out.
GoPro is cool cause the image is a bit brighter and it comes with a bit more out of the box, but also at a bit higher cost. It's best quality is the chest mount which can be used for a lot of sports with great stability. The wide angle lens looks pretty neat for things closer up.
Con's... The helmet mount looks a bit gooberish and awkward. Imagine getting a little to close to a tree and having it slam into the camera...Not exactly low profile. The buttons are a bit small... so on a 0 degree powder day... you may be a little annoyed with needing to take the gloves off occasionally.
Personally, I prefer the low profileness/ease of the contour camera a bit more considering i dont do anything that i couldn't use the helmet/pole/goggle mounts for. It is a bit darker, but nothing a rendering through nearly any video editor cant handle.