[colanderman]

If all you care about is QPS, by all means, stick with MySQL.

People like myself use Postgres because it has a much richer feature set. See http://stackoverflow.com/a/5023936/270610 for some examples. Personally I find MySQL beyond frustrating due to its lack of… well almost all of those. Recursive CTEs in particular, but arrays and rich indexing are pretty core too.

Postgres's query optimizer is far more advanced too. MySQL doesn't even optimize across views, which discourages good coding practices.

The documentation is fantastic. Complete and well-written, covers the nuances of every command, expression, and type. MySQL's doesn't hold a candle to it.

Don't know what you mean about "unfriendly". Help is built into the command-line tool, and like I said, the documentation is fantastic. Maybe MySQL is a little more "hand-holdy", but I don't care for such things so I wouldn't know.