I have experience building a mobile app using Ionic framework. Ionic uses Angular for its view library. In my opinion, one thing that I dislike about Angular is documentation. I think Angular has lack of documentation. It has short explanation and no examples/use case for that function. I don't know if the documentation has changed since then because I built that app in 2015.

Now, when reading Hacker News, a lot of people post about React. I have never learnt before. Maybe, I am late to the party. I must dig posts about React to know its use cases.