It depends on the project but a couple things that would help me pick MySQL (MariaDB) more often (wish list) are:

- Row-level security (RLS) - depending on the tenancy and DB level safe-guards you need Postgres supports it and MariaDB doesn't - transactions for schema changes - Postgres (and even sqlite) support this but MariaDB doesn't. Due to not having it, if there's a faulty migration manual clean-ups might be required to get it back to the state you need