Dedoimedo has an outstanding site with lots of reviews and information. As he has done in the past, he is reviewing Ubuntu MATE 20.04.
His reviews are often tough but are very well-written, with a lot of good critical commentary. I'd like to say Ubuntu MATE 20.04 knocked it out of the park with him, but sadly it did not.
The review is here: https://www.dedoimedo.com/computers/ubuntu-mate-focal.html