When comparing ChromeOS Flex vs RebornOS, the Slant community recommends RebornOS for most people. In the question“What are the best Linux distributions for an old machine?” RebornOS is ranked 30th while ChromeOS Flex is ranked 39th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Lightweight and fast
This is basically just Chrome OS which already runs on Cheap chrome books. It works well for web browsing and file storage on low end computers.
Pro You can try it via bootable USB
Pro Antergos with more desktops
Pro Highly and Easily Configurable
You can easily choose from a list of browsers, desktops, office suites, etc, all from the installer.
Pro Good Repo
Reborn's dedicated repo has some extra packages that are difficult to find elsewhere, in addition to the official Arch repos, community repos, and the AUR.
Cons
Con Limited hardware support
There is a list online of about 100 or so computers that officially support Cloud Ready, but it can also work on a laptop not on that list, results may vary.
Con Only really meant for web browsing
To use the software, you need to have a Google account and log in. Because it's meant for web browsing and researching, you won't find software like Steam, Office, Adobe Photoshop, Aftereffects, etc; or even a 3rd party browser other than Google Chrome.
Although there are plenty of alternative web browser online, and in the Chrome Web Store, which is still supported by Chrome OS.
Con Crashes
Crashes every time when trying to install.
Doesn't even install it in virtualbox or VMWare.
AVOID.