The angular framework is the more popular framework and is developed by Google. React is a framework developed by Facebook and it has slowly started to gain momentum in the field.
Angular uses Typescript language while React uses JSX.
Both have high tooling.
The biggest difference is in size Angular 2 currently is around 764k while React is around 151k.
Angular works on a Regular DOM while React works on a virtual DOM.
The debugging, in general, is good HTML and good JS for Angular while react has good JS/bad HTML.
Thus the learning curve for Angular is medium while that for React is low.
Mobile react has its own way through React Native while Angular have an Ionic framework for the same.
React provides a Debug line NO and unclosed Tag while also having Unidirectional binding, Angular, on the other hand, does not have a debug line NO or unclosed tag and it has a 2-way binding.
Debugging is an important part of any frameworks and both these frameworks have different types of debugging with Angular having runtime debugging and React having a compile-time debugging.
Both render on the server side.
MVC is present in angular framework while in react it is only in the view layer side.
A lot of big companies around the world use both these frameworks.
Angular is used by PayPal, Nike, Google and Sony among others while React is used by Alipay, Airbnb, Facebook, and Netflix.
Both these frameworks are great and they provide equal opportunities in development. Angular is really good at declarative solutions while react is far ahead when it comes to simplicity. Both have their pros and cons but overall both of these are amazing new frameworks which are going to be used a lot more in the future.
There is no clear winner between them and in the end, it will depend on the developer to choose the right solution which will suit the goals and strategy of the whole project.