Except it's really a "What over-engineered monstrosity have you built?" in the theme of "choose boring technology"
p.s. MariaDB (MySQL fork) is technically older and more boring than PostgreSQL so they're both equally valid choices. Best choice is ultimately whatever you're most familiar with.
PostgreSQL from 1996, based on Postgres95 from 1995, based on POSTGRES from 1989, based on INGRES from 1974(?).
I wonder if any lines of 1970's or at least 1980's code still survive in some corner of the PostgeSQL code base or if everything has been rewritten at least once by now? Must have started out in K&R C, if it was even C?
Somewhere there's a CVS repository with some history from before the import into the current repository, but unfortunately there's a few years missing between that repository and the initial import. I've not done the work to analyze whether any lines from that historical repo still survive.