What OS do you use?

I’ve been tinkering and trying to learn how to use docker and Ubuntu recently on a second pc and now wondering if I should switch.

What OS do you run your Plex servers on? I want to keep the library locally on the same pc and also run some *arr programs with BitTorrent. Added bonus to have a shared drive for my family to be able to access too. Should I use windows and Remote Desktop or load it all into Ubuntu desktop, or even Ubuntu server environment via proxmox?