When comparing Complete Linux Installer vs UserLAnd, the Slant community recommends Complete Linux Installer for most people. In the question“What are the best ways to run Linux applications on Android?” Complete Linux Installer is ranked 3rd while UserLAnd is ranked 7th. The most important reason people chose Complete Linux Installer is:
Ubuntu, Debian, Fedora, ArchLinux, Kali Linux, openSUSE. You can even install more than one at a time.
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Pros
Pro Multiple distributions available for download
Ubuntu, Debian, Fedora, ArchLinux, Kali Linux, openSUSE. You can even install more than one at a time.
Pro Access to the Android filesystem
You can read and write files outside of the app's sandbox via a mount point in the chroot environment.
Pro Easy configuration
The images are preconfigured for Android, so everything mostly just works.
Pro Support for X out of the box
If you need a X Session vnc gets started with a single click. No configuration needed. Usable on the android host or any other device capable of running vnc.
Pro No root needed
You get a full Linux environment without the need to root your device.
Pro Easy setup
No longer than 5 minutes and you have a full blown XFCE desktop running.
Pro Free and Open Source
Like Termux - UserLAnd is an entirely open source application - the developers are responsive on Github and actively working on the project.
Cons
Con Drains battery
These are full desktop distributions. Running them takes a lot of power.
Con Requires root permissions
You can only install this on a rooted device.
Con Website is down
The project may have been abandoned.
Con Not supported below Lollipop
This is actually an issue with the programming and having to work around different architectures, but it still really stinks.