Not sure if relevant, but for me, when I want to develop quickly and reliably, I go with mySQL, because that's what I know best. Then when I'm motivated, and f

Not sure if relevant, but for me, when I want to develop quickly and reliably, I go with mySQL, because that's what I know best. Then when I'm motivated, and find a DB that's really interesting, I force myself to use it (like couchDB) in order to learn my way around it. That's how I decide what to use.