Started using rails 10 years ago, myself. Postgres was by far the most common recommendation. In fact I learned a rule of thumb, early on, that I abide by still

Started using rails 10 years ago, myself. Postgres was by far the most common recommendation. In fact I learned a rule of thumb, early on, that I abide by still today: Always start with postgres and only migrate out once you understand your data well enough to consider the migration a clear win.