Choosing between React and React Native depends on the specific needs of a project, as both serve different purposes despite sharing a common syntax and component-based architecture. React is an open-source JavaScript library designed for building web application user interfaces, utilizing reusable components and the virtual DOM for efficient and dynamic page updates. In contrast, React Native leverages React to create native mobile applications for platforms like Android and iOS, using native UI elements to ensure apps look and feel consistent with each platform's design system. The knowledge gained from React is transferable to React Native, making it a matter of determining when to use each library based on the project's requirements. React Native for Web and desktop extensions like React Native for Windows and macOS extend its utility across different environments, allowing developers to harness the same skills for diverse applications. Contentful provides tools and resources that integrate with these libraries, offering a composable content platform that optimizes content delivery for various devices, enhancing both web and mobile app experiences.