Both the GoPros (Hero4 Silver) and pro cam (Canon Vixia HF-G20) record in 1080P HD quality. Both have a LCD screen so a user can see what they are recording. The GoPros do have some advantages:

- waterproof

- compact

- special photo modes - time lapse and burst

The lightweight, easy to use pro cam (Canon Vixia HF-G20) has the following advantages:

- optical zoom for crisp, clear close ups

- better sound recording

- external light

- high quality video in low light settings

Here is a video comparing our cameras:

GoPro sample with a drone. The scene you see at the very end of the first video (with the GoPro) is a good example of the low light capabilities of one camera versus the other. 

Pro camera sample: