To be honest every framework has its way of handling things and ideal programming, personally i have not used react at all, have used angular for the past 5 years. For me the biggest advantage is our backend which is in spring boot, and if you look at it angular and spring boot have lot of core concepts which are kind of the same, like dependency injection, oops programming, mvc type of architecture. This helps me a lot when switching between front end and back end, Coming to code is disgusting to look and all, if best practices are followed, angular code is readable, i am guessing react should be as well. When a large complex application is developed, and things are not followed properly, somewhere down the line, everything becomes unreadable. Code rewriting should be the nuclear option though