The difference in speed between Angular 1 and React was like the difference between Python and Rust. Not only was React simpler than Angular and had fewer footguns, but it was so ridiculously fast out of the box compared to Angular.

Then Google google'd and left devs high and dry with the need to rewrite their apps from Angular 1 to Angular 2+, whereas React has been relatively stable, despite some incompatibilities -- yes there are new features and new methods, but you can still do React classes.