Ars Technica in their series on setting up your own web server, Web Served, recommended MariaDB as the database to use. As for why they chose MariaDB over other offerings like Postgresql and MySQL, they said in part:
"[MariaDB is] faster than MySQL and has fewer bugs, but still acts exactly like MySQL as far as applications are concerned. What's not to like? Let's get it!"
We couldn't agree more!