eknkc has a point. Let me explain our needs and why we chose MongoDB over PostgreSQL (and I have been a huge fan of PGQL since before the MySQL/PGSQL flame wars).

Replication is not very easy to setup in PGSQL. Sure, I can do it, but our product is an on-prem product that our users are responsible for configuring and maintaining. Having them configure PGSQL replication would be something they're not willing to do. MongoDB's configuration of replica sets is quite trivial compared to PGSQLs.

I bring this up every time someone says "PGSQL > MongoDB", even on PGSQL threads where PGSQL devs participate and they admit it's not quite there yet, but that they're working on it.

And all that said, it is getting demonstrably better to configure replication in PGSQL, so it's going to get there some day and I can't wait.