When comparing RemixOS vs Chromium OS, the Slant community recommends Chromium OS for most people. In the question“What are the best Linux distributions for an old machine?” Chromium OS is ranked 49th while RemixOS is ranked 51st. The most important reason people chose Chromium OS is:
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.
Specs
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Pros
Pro Fast
The simple fact that its a real operating system, and not an emulator, means that you can use it without emulator related slow downs.
Pro Google services
The latest version of the Remix OS downloaded for it's official website comes with the Google play store, etc. When you are booting up he latest version of the OS it's asks you whether to enable or disable Google services... You can choose whether to enable or disable according to your needs.
Pro Free
There's never as good a price as a grand total zero dollars, and that is exactly what this will cost you. That means that if it does not work, if your not happy with it, or if you just cant afford buying an operating system, you can still get RemixOS.
Pro Kernel
compatible kernel
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 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.
Pro Lightweight
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.
Cons
Con Still in beta
As of March 2016, RemixOS for computers is still in beta, meaning that some things might not work.
Con No Google Play services
Google play is the biggest go to for mainstream android apps, so it can be quite disagreeable not to have it out of the box.
Con Problems with Nvidia cards
Many people seem to have problems loading React OS with nvidia cards. This may be due to maxwell driver issues.
Con Dead
Killed off in 2017 by it's creators, it is no longer in development.
Con Google
Possibly harms your privacy.
Con Made for developers
ChromiumOS is mainly made for development, so there exist no official install images and you have to build it from source or use third party images like Arnold's or the waterfall images.
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.