Heken H9 is absolutely one of the cheaper action cams in the market. The quality of Heken H9 videos is similar to SJ4000+, but this camera is cheaper.
Heken H9 has Sunplus 6350 chipset and OmniVision OV4689 sensor, the same mounted on SJ4000+. It has a back screen, so you can see what you are recording live, change settings, and playback your videos and pictures, all very useful features.
It can register 4K @ 10fps, 2.7k @ 15fps and 1080p @ 60fps. Obviuosly 4k and 2.7k cannot be used as they’re only 10fps and it’s just marketing, but 1080p @ 60fps is still the best resolution to shot action videos.