The VLOGG camera is the best way to vlog. VLOGG moves the preview window by your camera so your eyes are looking in the right place.
Since the screen is not covered by the video window, you also have the option to turn on different lighting styles like a Ring Light or LED Light in warm or cool lighting.
The whole screen is also your start and stop button making it super quick to use. You can still flip around to the back camera and even quickly changed between 720, 1080 and 4k resolutions.