Both MongoDB and Hadoop are hugely popular options for handling Big Data and are employed by top organizations across the world. Both Hadoop and MongoDB are open-source, schema-free, and support NoSQL; their data handling mode is entirely different. MongoDB is developed using C++ and offers excellent memory handling capabilities, while Hadoop, developed using Java, is better at space optimization. However, Hadoop was built specifically for Big Data, while MongoDB was not made for the same purpose. So Hadoop offers better support for batch processing.