The amount of work is on the server side, but they are forks of the same code. The sharing side is not as complex. Plex has hit an impass on remaining solvent as a business. Emby is even in a better situation than Plex is and quite frankly, I don’t see a reason to use them when Jellyfin is an option.
I use Jellyfin - music, shows, movies… it’s open-source and has a lot of features Plex doesn’t including, not having to create an account. It’s your’s to do what you want.
I’d try Debian or if you’re feeling adventurous, EndeavourOS.
I like GNOME better with extensions. My main reason for using it is Wayland.
The AUR is the best part of Arch.
This is really just a power-grab move. There already is “Let’s Encrypt” - try going to a website that isn’t https. You’ll know right away that you might have typed a web address wrong.