Which one is best React JS, Next JS, React Native?

ReactJS, Next.js, and React Native are all frameworks built on top of the React library, which is developed and maintained by Facebook. They have different use cases and are designed for different types of applications.

ReactJS is a JavaScript library used for building web applications. It allows developers to create reusable UI components and render them based on the application state. ReactJS is typically used for building complex, interactive web applications with a lot of user interaction. It is often used in conjunction with other libraries and frameworks, such as Redux, to manage the application state.

Next.js is a framework built on top of ReactJS that adds server-side rendering, static site generation, and other features to improve the performance and SEO of web applications. It is used for building complex, data-driven websites and web applications, particularly those that require dynamic content and real-time updates.

React Native is a framework used for building mobile applications for iOS and Android using ReactJS syntax. It allows developers to use the same codebase to build native applications for both platforms, which can significantly reduce development time and costs. React Native is designed for building mobile applications that have a lot of user interaction, such as social media apps, e-commerce apps, and games.

In terms of which one is best, it really depends on the specific requirements of your project. If you are building a complex, interactive web application, ReactJS is a good choice. If you need server-side rendering and static site generation, Next.js is a good choice. And if you are building a mobile application, React Native is a good choice. It's worth noting that all three frameworks have a strong community of developers and a large ecosystem of plugins and libraries, which can make development faster and easier.