GNOME. A lot of people customize it to look and behave more like Windows or Macos, and I used to as well, but after giving the default configuration a chance and getting used to it, I prefer it over everything else. It’s way more focused and organized, and I can navigate through my open windows quicker and easier. It’s just a different workflow you need to adjust your brain to.
people like to share their screens with friends. generally so they can stream a game for them to watch or so people can watch stuff together