Your Action Camera Resource
Yi Action Camera 2 features a 3-axis sensor stabilization, which means the sensor is leveled during small movements to stabilize the image.
Revl Arc features a gimbal which sits on the back of the camera, which levels the camera when you move it.
Sony FDR-X1000 records GPS data so you can track where you recorded your videos and photos
Revl Arc recordes even more data such as G-Force, height and with a harte rate monitor also your pulse. You can display the data in your videos and the camera will use this information to automatically edit a highlight video based on the best scenes recognized by telemetry.