When comparing Chromium OS vs CloverOS, the Slant community recommends CloverOS for most people. In the question“What are the best Linux distros that don't use systemd?” CloverOS is ranked 15th while Chromium OS is ranked 35th. The most important reason people chose CloverOS is:
Minimal install to build upon.
Specs
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Pros
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.
Pro Minimal
Minimal install to build upon.
Pro Fully Gentoo compatible
It is fully compatible to Gentoo.
Pro No UEFI support
If you use older computers and want neither UEFI nor systemd.
Cons
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.
Con No UEFI support
If you have a system that can only boot EFI you are fu**ed!