I've used and followed Angular 2 somewhat over the past year. My take is that React is better for engineers familiar with JavaScript, while Angular may be more comfortable for engineers with a preference for Java/C#. I don't mean that in a bad way; it's simply been my experience that people coming from those languages love what they see of Angular 2, and are repelled by React.

It's not hard to see why. This code[0] from Angular 2 would just be a function in React:

    @Pipe({
      name: 'tempConvert'
    })
    // The work of the pipe is handled in the tranform method with our pipe's class
    class TempConvertPipe implements PipeTransform {
      transform(value: number, args: any[]) {
        if(value && !isNaN(value) && args[0] === 'celsius') {
          var temp = (value - 32) * 5/9;
          var places = args[1];
          return temp.toFixed(places) + ' C';       
        }
    
        return;
      }
    }

There's also the fact that Angular is a framework, whereas React is a library. Those of us in JS land typically (but not always) prefer smaller libraries.

[0] https://auth0.com/blog/2015/09/03/angular2-series-working-wi...