For my helmet I’ve been very happy with my Drift Ghost S which isn’t made any more. It can shot in 1080p at 60 FPS which is great, with a smooth resolution when traveling fast. The current version designed by Drift is now at 4K quality with stabilization and a dual mic. If anything happens to my current Drift that will be my go to upgrade.
What I really like about the camera is the cylindrical shape design and 300 degree rotating lens. These two factors make it way easier and convenient to mount to a helmet, and other areas of my bike than the cube/body shape of a GoPro.
https://driftinnovation.com- Wolf