MySQL and MariaDB are very similar and most software can use either of them without any problems or special configuration. There are some minor differences in performance, stability and technical features, but they are pretty minor.
We used to run Percona Server quite recently, which is almost identical to MySQL, but recently switched to MariaDB.
Looking at what you wrote in your other topic, Moodle supports MySQL and MariaDB, but needs a configuration flag to be set to work with MariaDB. That should be an easy fix though.
I will copy and paste your comment in the Moodle discussion forum to seek for help.
By the way, I saw another LMS called Forma. It looks good too but did anyone install this in here successfully before? Please share your experience with me. Thank you very much.
Currently I just recovered from Covid19 but feeling weak. I wish everyone safe and keep yourself healthy and fit.