You should try one huge monitor and use an addon that let you snap windows to 1/4, 1/2 of the screen, etc (30+ inches).... Been using Wayland for years with no problems
It doesn't matter that much, but I like Arch... it's a bit of a pain to install if you are new to Linux though. I find it more stable than Manjaro though.
Your decision probably should depend on if you like KDE or Gnome and if you want the latest software or something a bit more stable.
You could also try the live version first before you install it to make sure everything works as intended.
taxes on companies only mean that you will pay more for their products.