When comparing Ubuntu MATE vs SliTaz, the Slant community recommends SliTaz for most people. In the question“What are the best Linux distributions for desktops?” SliTaz is ranked 27th while Ubuntu MATE is ranked 73rd. The most important reason people chose SliTaz is:
The core liveCD is only 35 megabytes. The boot-from-internet option fits on a floppy.
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 One of the smallest distributions with desktop GUI
The core liveCD is only 35 megabytes. The boot-from-internet option fits on a floppy.
Pro Very fast
Pro Can add desktop effects
SliTaz has a feature called "Desktop Effects" which can add shadow or fade effects to windows.
Pro Very customizable
SliTaz is very customizable. You can programatically edit and change anything you want on how the OS looks or behaves.
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 Install instructions are in French
When first booting SliTaz from a USB or from a Live CD, the installation instructions are in French.
Con Not much variety as to available applications
SliTaz does not have as many applications in its repositories as the bigger distros such as Ubuntu.