[CuriouslyC]

- A robust security model with role inheritance that supports both column and row policies.

- PLV8/PLPython/C functions/etc (with security!)

- TimescaleDB

- Better JSON query support

- Foreign Data Wrappers

- Better window function support

- A richer extension ecosystem (IMO)

Honestly, at this point I wouldn't use MySQL unless you only care about slightly better performance for very simple queries and simpler multi-master scaling/replication. Even saying that, if you don't need that simple multi-master scaling RIGHT NOW, improvements to the Postgres multi-master scaling story are not too far off on the roadmap, so I would still choose PG in that case.