PostgreSQL has been hot for years, but that hotness can also be a challenge for enterprises looking to pick between a host of competing vendors. As enterprises look to move off expensive, legacy relational database management systems (RDBMS) but still want to stick with an RDBMS, open source PostgreSQL is an attractive, less-expensive alternative. But which PostgreSQL? AWS was once the obvious default with two managed PostgreSQL services (Aurora and RDS), but now there’s Microsoft, Google, Aiven, TimeScale, Crunchy Data, EDB, Neon, and more.