Moving from AngularJS to Angular is as hard as moving to any other tool because the only thing they share is the name-ish. React is my logical decision because for me it simpler due to its use of JavaScript. You don't have magic as with Angular. You use plain JavaScript to code, and things just work. The new Angular is a copy of React (mostly). And having to work with TypeScript makes things messier. You can migrate React to TypeScript, but if you have no experience, you don't need to use it. For me React is cleaner and simpler than Angular as "the new technology to use to migrate all your codebase". You can always leave your clients with the old app, and add a button to a new and shiny app in development, and ask them to try and give feedback. Doing this, you will find what's important for them, and which parts need to be prioritized instead of migrating all from a to z. It also helps your clients to learn the application step by step instead of having a sudden change to a new app that they don't totally know. Doing this you allow them to compare the old and the new one, and find their way around easily. Hope this helps you :)