Angular and React offer distinct approaches to web development, with Angular providing a comprehensive framework that includes built-in features like form handling, routing, and state management, while React functions as a flexible library focused on building user interfaces. Angular uses TypeScript and employs two-way data binding, simplifying the synchronization between the UI and app state, which is beneficial for rapid development in projects with heavy data entry. React, on the other hand, utilizes JSX and a one-way data flow, promoting maintainability and scalability through its component-based architecture, often relying on additional libraries for routing and state management. Performance optimizations in Angular are achieved through AOT compilation and the Ivy renderer, while React leverages its virtual DOM and techniques like code splitting to enhance app responsiveness. Both have vibrant communities, with Angular favored in large, complex applications and React preferred for projects requiring flexibility and rapid, interactive UI development. Error monitoring tools like Rollbar integrate with both frameworks, offering real-time insights to ensure robust application performance.