I like PostgreSQL. If I am storing relational data I use it.

But for non relational data, I prefer something simpler depending on what the requirements are.

Commenters here are talking "modern tools" and complex systems. But I am thinking of common simpler cases where I have seen so many people reach for a relational database from habit.

For large data sets there are plenty of key/value stores to choose from, for small (less than a mega byte) data then a CSV file will often work best. Scanning is quicker than indexing for surprisingly large data sets.

And so much simpler