When using JHipster you have an option to choose between Angular and React as the client-side framework. Do not choose something just for its hype, choose based on your requirement, team composition, and familiarity:
- If you come from a heavy Java/Spring background, then Angular will be much easier to follow and work with
- If your application requires heavy state management and shared state, then React would be a more natural fit
- If you are planning to build a native mobile client for your application then the more mature React is a good choice for this space, with React Native allowing you to reuse a lot of code between your web and mobile application
- If your application depends heavily on HTML pages produced by a design team or a third-party, then Angular will be much easier to integrate than React
If you need a lot of widgets that are not part of standard Bootstrap, then use an existing widget library, such as PrimeNG or VMware Clarity, rather than assembling widgets from different origins. However, if you need only a few more widgets on top of Bootstrap, then stick to Bootstrap and use a Bootstrap compatible widget for Angular or React.
Regardless of what you choose, follow the guidelines and best practices from that project's community.