When Redash was created 5 years ago we chose AngularJS as our frontend framework, but as AngularJS was replaced by Angular 2 we had to make a new choice. We decided that we won't migrate to Angular, but to either React or Vue.js. Eventually we decided to migrate to React for the following reasons:

1. Many in our community are already using React internally and will be able to contribute.
2. Using react2angular we can do the migration gradually over time instead of having to invest in a big rewrite while halting feature development.

So far the gradual strategy pays off and in the last 3 major releases we already shipped React code in the Angular.js application.