As a new or new-ish diver, you’ll want to minimize task loading. Get a mask or shoulder mount, set it before the dive, and forget it. Either of those options (I have both, but tend to use the mask mount) result in zero drain on your attention/focus.
I like my mask mounted setup, but I’m using it for me...to capture the occasional brief clip of something neat or to edit out an individual image of something cool later. I generally use my GoPro videos more to chop out pictures later though.
The mask mount is fine for that kind of thing. I like it because It results in no drain on your attention, unlike keeping it in your hand. That being said, if you’re a wannabe film producer and plan on uploading videos online of your adventures, don’t get a mask mount.
I’ve uploaded a couple x < 10 second clips to illustrate a point. Ex. Visibility sucked, check out this cool tooth I found, etc. If the videos are more for you and you’re going to be content with that level of sharing, the mask mount might be for you.