When comparing Chromium OS vs Bliss OS, the Slant community recommends Bliss OS for most people. In the question“What are the best Linux distributions for desktops?” Bliss OS is ranked 50th while Chromium OS is ranked 89th. The most important reason people chose Bliss OS is:
Comes with a taskbar launcher and the Pixel launcher.
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 Extra launchers
Comes with a taskbar launcher and the Pixel launcher.
Pro Rooted with a few clicks
Similarly to android-x86, it's rooted with just a few clicks, thus allowing the use of AdAway and other Ad Blockers.
Pro ARM Virtualization
Like android-x86, it comes with ARM virtualization support, so you can run many Android ARM apps on your x-86 device.
Pro Google Play Store
Google Play Store is installed by default.
Pro Simple Linux distro
Like ChromiumOS it has a very simple(stipped down) user interface that is easy to understand and use.
Pro Android Apps
There exist an app for any task.
Pro Unique
It is unique compared to taditional GNU-based Linux distributions.
Pro Multi-platform
Android is available for PCs, Phones, Tablets, TVs and even Clocks.
Pro Familiar UI/Design
Everyone who owns an android device already know the OS.
Pro Fully opensource
It is fully opensource and there is no company behind it.
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 Limited hardware support
Like android-x86, it has limited hardware support.
Con Not for power users
Android is designed for everyone so it might be a bit limited for power users.