Efficient Data Storage in File System and DBMS

Hello All, I am a software developer and got the opportunity to work on a large web development project. I want to know which source allow efficient data storage feature between file system and dbms in a large project. I have asked this query on Quora and according to this post, The use of a database management system is efficient because there are numerous techniques for storing and retrieving data but not an idea about file system. Can anyone use both of them? Any suggestions?