To paraphrase Ansel Adams (who was talking about cameras), "There's no one best database, only the one best database for what you're trying to do." If this is

To paraphrase Ansel Adams (who was talking about cameras), "There's no one best database, only the one best database for what you're trying to do." If this is a clean sheet project and you're building a web app in JS, the natural form for that data is JSON or NOSQL. One choice I like is Firebase because it has a generous free plan that will let you develop and even deploy to real customers before you start paying for usage. It's also pretty easy to integrate into your app with lots of good examples. It also integrates well with other auth systems, like anonymous visitors, Google login-in, and FB. Just one idea!