When comparing Chromium OS vs RebornOS, the Slant community recommends RebornOS for most people. In the question“What are the best Linux distributions for desktops?” RebornOS is ranked 53rd while Chromium OS is ranked 56th.
Ranked in these QuestionsQuestion Ranking
Pro Minimalistic interface
Chromium's system UI uses as little screen space as possible by combining apps and standard web pages into a minimal tab strip: While existing operating systems have web tabs and native applications in two separate strips, Chromium OS combines these, giving access to everything from one strip. The tab is the equivalent of a desktop application's title bar; the frame containing the tabs is a simple mechanism for managing sets of those applications and pages.
Because Chromium OS is designed for users who spend most of their computer time on the Web, it is intended for use in computers with little local storage and fast boot-up times.
Pro Safe and requires little to no maintenant
Since you only have the browser, you cannot install applications (outside Chrome Apps which are decently protected by their limited API and the Chrome Web Store). This means no harmful virus, and also nearly no way you can screw your system. Everything will just work.
Pro Great community!
Pro Runs Android apps
Reborn OS has a program that allows you to install and run Android apps on your desktop. Great for app developers or those who might be addicted to a certain app.
Pro Flatpak support
Having Flatpak support adds a nice graphical app store to the OS. You can find most software you might need in there.
Pro AUR enabled by default
The Arch Users Repository is already enabled. Really helps with finding some proprietary software.
Pro Arch Customization without the hassle
You can choose from 15 different desktop environments. Choose from a list of software to install that lets you pick web browsers, Spotify, what kind of office suite, etc. Not as robust in terms of choosing what you install compared to Arch, but more than enough for newcomers and those just looking to get things done. Nice midweight OS.
Possibly harms your privacy.
Con No auto-upgrade (unlike Chrome OS)
Chrome OS auto-upgrade the system, but Chromium OS does not. It's possible that they're thinking about adding that feature from the design doc.
Con Can be a little buggy sometimes
Although not outright system crashes or freezes, but programs not working correctly after an update is quite common. Some desktop environments can be temperamental. Examples: running Deepin DE at first and the zoom for the display is 150%. You can fix this by going to settings and setting the desktop to 100%, but then something else might happen, e.g. you lose icons on the dock. Minor headaches and some are easily fixable. Certainly not a deal breaker.