I prefer Postgres because of its (in my opinion: better) features and my familiarity with it. It wouldn't be a challenge to setup a MySQL/MariaDB database if I

I prefer Postgres because of its (in my opinion: better) features and my familiarity with it. It wouldn't be a challenge to setup a MySQL/MariaDB database if I wasn't already running a largerish Postgres instance where I want to store my stuff. So the deal breaker here is me not wanting to have two DBMS running on the server.