When comparing Ubuntu MATE vs PsychOS, the Slant community recommends PsychOS for most people. In the question“What are the best Linux distributions for desktops?” PsychOS is ranked 24th while Ubuntu MATE is ranked 73rd. The most important reason people chose PsychOS is:
PsychOS is designed for older/lighter, 32-bit, i686 hardware with plans to go even further back with i486 (PsychOS486), i386 and older (PsychDOS), and so on and so forth as opposed to always trying to run on the latest hardware, not that it could in most cases anyway since 32-bit i686 operating systems will run on most x86_64 ones.
Specs
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Pros
Pro Simplicity of Gnome with the power of Ubuntu
Debian was good to use but has limited documentation and is difficult to pick up. Ubuntu MATE brings the ease of design and logic of the Gnome 2 style desktop so it's easy to get around coupled with the vast documentation, forums and ease of learning/using the Ubuntu system.
Pro Works great on old laptops
It does not have a lot of system requirements so it works pretty well even on older laptops.
Pro Perfect for people who like Gnome 2
The goal of MATE is to maintain the look and feel of Gnome 2, while maintaining compatibility with Gnome 3. To that end, it has also forked and renamed many of Gnome's core applications. It benefits from the years of work and polish that have gone into the Gnome project.
Pro Highly configurable
Comes with an option to configure as Windows-like, Mac-like, Gnome-like, etc. in a single click. Wonderful to get you started without having to learn it all from scratch.
Pro Behaves like Ubuntu with Unity - after Ubuntu-Gnome transformation
No better place to continue Unity experience with Ubuntu (Left-side panel, HUD) and not as awkward as Gnome.
Pro Based on Ubuntu
Pro Runs well on older, 32-bit hardware (i686)
PsychOS is designed for older/lighter, 32-bit, i686 hardware with plans to go even further back with i486 (PsychOS486), i386 and older (PsychDOS), and so on and so forth as opposed to always trying to run on the latest hardware, not that it could in most cases anyway since 32-bit i686 operating systems will run on most x86_64 ones.
Pro RetroGrab is really cool
It lets you install old software for use with emulators like DOSBox but run them as if they were normal programs from the normal applications menu.
Pro No fuss. Just works.
A lot of the programs are already set up for you. Just boot it and go. This is definitely one of the better SHTF distro's.
Pro QuickEdit
There's a yad-based tool you do not see on any other GNU/Linux distro in which you can simply right-click pretty much any file and then use the "QuickEdit" option to quickly edit small things about a file such as size if it's an image or video, convert the file, or even render the file if it's a Blender project. It's nice not having to open an image with GIMP every time I want to resize or convert something.
Pro The IceWM option looks and functions nice
Most GNU/Linux distributions that include IceWM as a desktop environment option don't do too much to it, if a t all. PsychOS seems to have a customized or themed version that actually doesn't feel you with dread and still uses many of the keyboard shortcuts from XFCE.
Pro Lots of command-line tools
Lots of command-line tools and I really like the CLIMax thing. It's a good tool to have if you want to spend time in the command-line but aren't that experienced. Also, it plays a quick, one-time ascii animation when you go into the tty for the first time.
Pro TONS of Thunar Custom Actions
PsychOS comes with a lot of Thunar Custom Actions, many of which as disabled, but they are there none the less; most probably just in case. Right-click on a DOOM WAD shows there's a menu item to play it directly using LZDoom.
Cons
Con No very good Software Center by default
The Software Boutique is not good. You can install Gnome Software from it.
Con Too much bloat included by default
Con Redundant
There is absolutely no reason to install it, since it uses the same package repositories as Ubuntu and you can transform any Ubuntu install into a Ubuntu MATE install.
Con Not bleeding edge
Users who want the latest and greatest software would be happier using Arch Linux, Antergos or another rolling release distro. However, because Ubuntu MATE is based on Ubuntu, users still have access to a large repository of recent software.
Con Bloated
Over 3000 packages by default including several package managers.
Con 7 package managers included
There should only be one.