AngularJS and ReactJS are two essential and popular front-end technologies with a distinct identity and of considerable importance in app development environments. The primary advantage of ReactJS is that updates for UI are automated.  As for AngularJS, it is known for being shareable and requires minimum coding.   Cutting edge as today’s technology over the internet is, such tech comes with its own list of benefits and risks. Therefore it is advisable to thoroughly evaluate the plus and minus factors in the web software product. These both are great for hybrid app development.  

What are ReactJS and AngularJS?

AngularJS is a holistic JavaScript framework that offers its users a full set up to construct a sturdy and feature loaded web application. As with most frameworks, it offers a programming sequence known as MVC structure which aids in standardizing and streamlining the complete web development workflow. Hybrid apps can benefit greatly from this. ReactJS is an open-source JS library that helps greatly in rendering views. AngularJS offers the model, view and controller as a complete framework. React is a widespread library that is responsible only for the view. One-way data binding also brings about various advantages of utilizing this tech over others available  

When to Use ReactJS and AngularJS

About ReactJS
This is great when working with dynamic content which changes with the view. This proves invaluable when considering rendering of views online- it avoids delay and enhances UI. React can also be utilized as the view element of AngularJS and other similar frameworks since it is not tied to other tech stacks. Users familiar with ClojureScript can use this for its immutable data structures.  
About AngularJS
Users needing a complete framework for the development process to run smoothly. AngularJS is designed to get a user to run his/her apps quickly. Since a library and framework can’t be compared, they can be applied interchangeably. React isn’t backwards compatible with browsers that came prior to IE8. To decide if ReactJS or AngularJS has to be used requires a thorough user needs analysis. The latest Angular 2.0 release in May 2016 comes with enhanced performance along with server-side rendering support and an identical method to utilize one-way data binding for manipulation of the elements of DOM that require changing.  

Advantages of ReactJS and AngularJS

What AngularJS offers
Problem-Free Decision making: This is a holistic framework offering excellent functionalities and options. It also aids the user in working at a faster pace without being weighed down with decisions. Component Structure: AngularJS 2 is known to have transitioned from a framework to a being a robust platform. This can be quickly used with other frameworks as well. Protracted functionalities can be executed through the shape of components, and also in the form of directives that can extend the functionality of pre-existing components. Development Environment: It is easy for users to choose the required environment using AngularJS. This can be anything from TypeScript, Dart, CoffeeScript to JavaScript Testing: This was designed to simplify application testing, even more so when users are making use of modules. Testing is made really easy here.
What ReactJS offers
JSX: The syntax of JavaScriptX or JSX appears to be identical to HTML and compiles to JavaScript. This makes coding to be completely efficient. Excellent User Interface: ReactJS is UI centric, allowing for a highly responsive interface for users. This is made possible with JS interactions across the Native environment of device. This will also help the application run smoothly. Extremely Efficient: Developers are offered a superior ease of working through Virtual DOM creation, which also minimizes time-intensive DOM operations and updates.

Difference between ReactJS and AngularJS

Wide Community Support
AngularJS has a far-reaching world-wide community which offers continuous support helping AngularJS developers, boosting the credibility and trustworthiness of this framework.
Full Framework
While AngularJS is a robust framework which is platform agnostic, ReactJS uses a collection of libraries which are time consuming and resulting in continuous work cycles.
Less Fatigue
Being comprehensive as a framework, AngularJS is flexible enough to take on tasks of varying complexity, whereas, ReactJS requires a group of libraries to execute even the smallest of tasks.
Two way binding
AngularJS allows changes in data where ReactJS is unidirectional and does not allow data changes without flushing the DOM
Fast rendering
Here ReactJS has the upper hand, with rendering done at a much quicker pace than possible in AngularJS.
Fails on Error and Explicit
ReactJS is better here since error is shown upon compiling, whereas in AngularJS it fails at run time only.

Conclusion

ReactJS and AngularJS both can be considered as reliable technologies for app development. While ReactJS is great at creating robust web solutions using its extensive libraries, AngularJS is a feature loaded framework which is a comprehensive web app solution. It is not a question of which one is better, but to what purpose each is best suited.