If your deciding which helmet cam to get this is a good video to review. All of the comparison shots were taken at the very same time. There wasn't any color correction on the comparison shots just straight out of camera. I hope this helps you make a decision between the two.
As for things i missed in the video:
The contour uses micro sd cards which are small and in less variety of regular sds. You lose them and they don't plug right in to the computer. Also I feel like if you could put a nice class regular sd in a contour you would have slightly better results. Contours micro sd's suck!
The new contour's come with a GPS function. I think its kinda gimmicky personally. But some adventure enthusiast will dig that!
The go pro's live video out function is sweet if your working in videos for anything where you want to know your composition before hand. I love it.
Also Go Pro is coming out with a screen soon!