iPhone camera MORE reliable.

Pros:
Can lock the focal settings as well as the light settings so the camera doesnt continually adjust.

Cons:
Crashes constantly in playback of videos.
Cannot precisely crop videos (must export them for precision cropping)
1 out of 10 videos has a problem with it (100% glitchy video)
Cannot fully forward to the end of videos you are reviewing.

In my opinion this will be a waste of time and money.

Canea100 about Filmic Pro－Video Camera