For my little hobby sites I use whichever best fits the application. If an application has a specific need for a function that is in Postgres and not MySQL the

For my little hobby sites I use whichever best fits the application. If an application has a specific need for a function that is in Postgres and not MySQL then I use Postgres. In my former work life we used Percona MySQL for the commercial support and very fast response to fix bugs and add features, but we also used Postgres and Oracle. In those cases it was more important to have awesome DBA's that could do anything with any database. I learned a lot from them and they earned a lot of respect from me. One of them could find significant design flaws in the application just be reviewing the schema. They cut our memory usage in half and bought us time to wait for the server vendors to support more memory in their next motherboard release.