PostgreSQL vs MongoDB : Which is best and why?
PostgreSQL is best when : You need Standard compliant, transactional and ACID (Atomicity, Consistency, Isolation and Durability) compliant out of the box which also has a wide support for NoSQL features.
MongoDB is best when : You need Scalability and caching for real-time analytics but is not built for transactional data i.e., accounting systems.
Difference between PostgreSQL and MongoDB
The main difference between PostgreSQL and MongoDB is that PostgreSQL is a relational database management system that uses SQL, whereas MongoDB is a non-relational, document-oriented database that stores data in flexible, JSON-like documents.