Hi. Not sure if this was already mentioned. If multiple UI is important to you, then with UM, I have about 9; maybe with Cairo Dock and Latte dock you could have tons of desktop looks.
Also, the UM OS has the Software Boutique where only the most popular apps are included.
The Welcome screen provides a button to install codec, so you can watch DVD's and other things.
Steam lets me play Microsoft Flight Sim 2020 and Osiris: New Dawn, another Windows game. These Windows games run flawlessly and for them to work on Linux just had to click on Properties of the games in Steam, select Proton--simple, a couple of clicks.
Viruses are another reason for choosing Linux--so many eyeballs pass over code that I feel secure, among other reasons like: since Linux is a small share of market compared to Windows, virus programmers are going to go for them; daily updates are another reason security is increased. The OS requires the Administrator password before allowing changes to OS, so that's another huge help.
For all these reasons I think UM is the best OS I have ever found. I gave the OS some money about three times--been using it since 2014, though. Coffee mugs bought, too. 
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