It is more popular than MERN
Abby, Editor at Wellpcb PTY LTD suggests that “Well, both frameworks have their advantages and disadvantages. MEAN- is an acronym for MongoDB, ExpressJS, AngularJS, and Node, so it is clear that you are using Angular as your front-end if you are using MEAN development. On the other hand, MERN – is an acronym for MongoDB, ExpressJS, ReactJS, and Node, so you are using React library as your front-end development.
Without a doubt, both are rapidly increasing & popular among the developers at the moment, and many companies are using these frameworks to build various applications. You can say there is no big difference between MEAN and MERN except for their Angular framework and React framework, respectively; it is hard to pick anyone from this.
But, yes, it varies in the perspective of the application need. MEAN is better suitable for large-scale applications, while MERN is better for faster development and smaller applications. Other than this, there is not much difference between these two. So, based on the need, you can choose the framework of your need.
But in terms of popularity, MEAN has the upper hand over MERN. So you can consider MEAN more adoptable by developers rather than MERN.”