SerenityOS

vs

Elementary OS

ReactOS is a free and open-source Windows-like operating system for amd64/i686 computers. ReactOS was designed to be binary-compatible with computer programs and device drivers made for Windows Server 2003 and Microsoft Windows NT family of operating systems including Windows NT4, Windows 2000, Windows XP, Windows 2003, Windows Vista and Windows Seven. To Some, ReactOS is a potential open-source drop-in replacement for Windows and for its information on undocumented Windows APIs

Linux is a family of free and open-source Unix-like operating systems based on the Linux kernel. Linux powers many things in the world today, from smartphones to cars, supercomputers and home appliances, home desktops to enterprise servers. Linux was first released in 1991 by Linus Torvalds as a free and open-source project. Today, Linux is typically packaged in a Linux distribution and released under different names. Some of the familiar being Android for mobile devices, or Debian, Fedora, or Ubuntu for desktop computers and servers.

macOS is a series of proprietary operating systems native to the Apple ecosystem. The operating system powers all of Apples desktop and laptop computers and is the second most popular operating system in the world after Windows.

Pop!_OS is a free and open-source Linux operating system for STEM and creative professionals who use their computer as a tool to discover and create. Pop!_OS is openly developed and released by the Linux hardware manufacturer System76. With Pop!_OS  you can unleash your potential on secure, reliable open source software. Pop!_OS is designed for fast navigation, easy workspace organization, and fluid, convenient workflow. Your operating system should encourage discovery, not obstruct it.

A Linux distribution that is designed from the ground-up to be a replacement for Windows or macOS. With Zorin OS you can get to know Linux quickly with a desktop environment similar to your previous experience with the commercial operating systems. Zorin OS let's you choose a desktop layout that mimic your previous OS, be it Windows or macOS. The operating system is built on-top of Ubuntu and runs on the same open-source software that powers the U.S. Department of Defense, NASA, and more.

Debian is a free and open-source operating system and GNU/Linux distribution that is openly developed by the community-supported Debian Project. The distribution was first released in 1993 and today it is the base of many other Linux-based distribution such as the popular Ubuntu. The project includes over 59000 packages, precompiled software bundled up for easy installation on your machine.