SQL is SQL is SQL. I have no problems jumping between different flavours of SQL, however what defines my use of them in my own projects is the toolsets I have for managing and maintaining databases.

Over the years, I have built up a collection of tools, drivers and utilities that just makes working with MySQL an absolute breeze across Windows and OS X. There are times that I want to use ODBC to dump a MySQL table or view into Excel/Access for a client, or copy data from a production system to a test system, or set up replication or do some performance reporting, and I like that I have tools set up which can do these things for me at literally the push of a button.

Sure I still use the CLI for MySQL a lot of the time, but nowadays, 75% of my time is spent in GUI tools of one sort or another.

If someone can give me an equivalent suite of these sorts of tools for Postgres that can let me be productive in short order, then I don't much care if the SELECT statement of one system is several milliseconds faster than the other. I don't deal with such huge volumes or mission criticality. I just want ease of management/maintenance.