GoPro 6 Advanced Stabilization:
Pros: It can make background very smooth and vibration free.
Cons: It sacrifices about 10% of view area.
Final Cut Pro:
Pros: It doesn’t sacrifice any view area.
Cons: It can’t remove small high frequency vibrations from engine, prop and winds.
Also, some expanding and shrinking movements around the edge of screen.
Test Enviroment: GoPro 6 (firmware 2.01) with Advanced Stabilization.
Final Cut Pro (10.4.3) with Smoothcam stabiliazation