Recommends hosting postgres yourself. Doesn't recommend a distribution stack. If you try this at a startup to save $50 a month, you will never recoup the time you wasted setting it up. We pay dedicated managed services for these things so we can make products on top of them.
Maybe come back when your database spend is two or three orders of magnitude higher? It gets expensive pretty fast in my experience.
There's not much to recommend; just use the Postgres from your distribution's LTS repo. I like Debian for its rock solid stability.