I wanted to try a Ubuntu flavoured OS on my Pi3B+ After a quick search, I downloaded raspex-ubuntu-18.04-LTS-lxde-4400mb-180328.img and gave it a try-out. I found that It is a very fastest and clean OS.
The RaspEX OS is still buggy, particularly when trying to install other programs using Synaptic Package Manager. I have also found that I cannot add users in the Users Settings.
I really like RaspEX for the Pi3B+. Just hope that some of the bugs can be overcome.
RPi4B 4GB with Raspian Buster
RPi3B+ with Raspian Buster
RPi0W with Raspian Buster