Both the GoPros and HD Cams record in 1080P HD quality. Both have a LCD screen so a user can see what they are recording. The GoPros do have some advantages:
- better photo quality
- special photo modes - time lapse and burst
- better in low light
GoPro one where they used a drone. The scene you see at the very end of the first video (with the GoPro) is a good example of the low light capabilities of one camera versus the other. The HD cams would not have been able to capture that scene.
Here is a beautiful one with the HD cams:
The GoPros come with 32GB memory cards and can hold about 4 hours of video each. The HD Cams come with 16GB and hold 2 hours of video.