Its for a family members small business where they have an event room they rent out from time to time. His partner pissed off the guy who did their AV setup, so now they are asking me.
So all three of these are AV Professional units, the Black Magic is a bit more live event/live venue focused. The TVOne is more conference room focused. The Analogway is kinda hybrid of the two but much more expensive.
I've used the ATEM Mini and it works great. It's like as dog simple as you can possibly get a couple of buttons to push and everything just fucking works.