This is with handlebar mount.
I have a GoPro with both handlebar and helmet mount. On longer rides, I switch them back and forth to get different viewpoints. I don't like the feel of the helmet cam. It feels top heavy, but I like that it is vibration free, and quiet, where the handlebar mount transmits road noise and some vibration. I have an older model Hero2 which has an annoying rattle that doesn't happen with the helmet mount. The higher viewpoint of the helmet cam sometimes has the effect of adults riding small clown bikes in wide angle perspective. The ladies I ride with don't like the handlebar mount, and call it the "buttcam". I would recommend both to make the video more interesting. A friend of mine uses a chest strap mount, which might be the best compromise of angle and point of view, as well as being vibration free and quieter, unless you are a heavy breather.
This is with helmet mount.