It’s difficult to choose between these two cameras and a lot of it comes down to what you’re looking for in a camera. If you’re looking for something straightforward with decent video quality out of camera and easier operation, buy the M20. If you’re interested in a camera that can be tweaked and customized and has better audio, go for the Git2.
This is my favorite SJCam I’ve tested to date, with excellent daylight recording and a unique form factor. Aside from some needed improvements with the gyro and low light recording, this is a good option for those looking for a budget action camera.