React is a Library V/S Angular is a Framework
Angular 4 is backward compatible with Angular 2 and beyond. Versions below Angular 2 are not backward compatible, however, and this is one of the drawbacks of Angular as a JS framework. React is a different story. React 16 is completely backward compatible with previous versions and even includes support for asynchronous rendering. It’s also completely open-source and licensed under MIT alongside GraphQL and Jest. Angular 2 is not backward compatible with AngularJS.
Applications using Angular 4 are robust in nature due to the usage of TypeScript. Although, Angular 4 could be difficult to learn for beginners when compared to React since it is a complete framework. However, the learning curve is smooth in Angularjs development, whereas with React, it becomes minimal when taken only the library into consideration.
However, when it comes to the usage and community support, Angular wins over React by a huge margin due to its credible backing. When comparing the raw figures, the number of tutorials and open-source contributions, Angular 4 wins over React which is behind in community contributions and collaborations. Angular is also globally used more than React.
In essence, The debate around React vs Angular is not gonna resolve anytime soon due to the pros and cons both posses like Angular is easy to scale up but takes time to deliver the project due to a relatively steeper learning curve and a lot of unnecessary syntax for simple things. This burns resources in terms of coding time and project deliveries. Whereas React takes up longer to set up than Angular but lets you create projects and build apps without much hassle though it lacks model and controller components. Thus, both have different use cases and are important in their own right. The selection of technology should be according to the project’s requirements and the resources that are deployed in the said project.