When comparing ChromeOS Flex vs PrimeOS, the Slant community recommends PrimeOS for most people. In the question“What are the best operating systems for old laptops?” PrimeOS is ranked 13th while ChromeOS Flex is ranked 19th.
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 Dual boot at single click with PrimeOS installer
Pro Standalone OS, better performance than any emulator
PrimeOS is standalone OS thus provides 2x performance than any emulator as emulator runs on a host OS.
Pro 3x better performance than windows budget laptop
Pro Android Gaming on PC
PrimeOS is equipped with a key mapping tool, DecaPro whihc let you play any Android game at the comfort of keyboard and mouse.
Pro Android Ecosystem with Desktop Interface
PrimeOS provides access to the whole Android ecosystem with complete desktop interface. Now use multiple apps on single screen with minimise, maximise and close option.
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.