After using mongodb for many years, I haven't run into a use case where I should have used it over SQL. The only benefit is rapid prototyping for me personally and it initially felt awesome to have mongoose in node be the schema as it was super easy to modify. But you pay for it big time as you go and find that anything difficult means you'll have to do backflips and more requests to get things done and get used to very strange and verbose nested json queries. It's the 10-15% use cases that are really hard. NoSQL is especially annoying when needing any type of joins because despite your best planning, it still happens. There were many cases I needed to fallback on postgres to get stuff done and have a second source of data to sync and then I was wondering why I didn't just do it all in postgres first.