Xiaomi Yi Action Camera 2 or Xiaomi Yi 4k is tge best budget camera.
This camera is best for outdooring and indooring also.
?This has a screen .
?Better battery life.
?Hd quality pictures.
?Light and fine looks.
It records video 1080p /60 framerate but Go Pro Hero 4 has 1080p /50 framerate on comparision with Go Pro Hero 4 price and Xiaomi yi 4k ,
The Xiaomi Yi 4k is better action camera the Go Pro 4 in all feild.
Thus I positively recommand to buy Xiaomi Yi action camera.