While React functions as a UI framework, Angular is a full-featured framework designed for broader use. Angular also presents some challenges for beginners, in part because it is an opinionated framework, which means it's structured according to best practices assumptions made by the people who created it. It also uses TypeScript (an object-oriented language) as its development language, so people who don't have a background with this kind of programming may need to do some additional work to understand how to use Angular. Angular is an older framework than React, and it's in wide use, but it's not being adopted by new users as much as it was when it was newer on the scene. This is the reality with just about anything in the front-end development world. The web changes, and so do the technologies we use to develop it.
It's important to note that Angular and AngularJS are two different frameworks. AngularJS is the precursor to Angular, so if you're looking for an updated framework, you should work with Angular. Note the name when you start your research to make sure that you are on track.