I don't mean to code shame angular. It has given me an excellent SPA development experience. Before moving to react, it was all angular. Change is always happening, and it was there around my corner too.
I have 5 main reasons for my angularjs to react migration. No, it's not a comparison on which is better. A comparison between apples and oranges would make no point. React is a library, and angular is a framework. Both can do stuff in their way. I hope to give a clarity(that I've gained) so that you can decide between the two for your projects.
React is not MVC – it is only a view library apt for developing composable and reusable user interfaces. Reusing components for User Interface is very beneficial. Single Page Applications use redundant components. A component gets input and fetches an instance of the component as output. Unlike angular, it is sufficient if a component is defined once according to your need, and then it can be used anywhere in your DOM.
React doesn't use templates - you can build user interfaces by cutting them down into simpler components. Flexible and powerful javascript makes it better for large and complex applications. By bringing together your markup language and the view logic, react makes the views to be much simpler to work with for future extensions and maintenance. The absence of string concatenation manually reduces the chance of XSS dangers. Whereas in Angular, I did find component interaction to be complicated.
Updates are straightforward – React follows a process called reconciliation. In this process, a lightweight representation of your view gets generated. It happens when a component gets initialized, and the render method is called. A markup string is derived from that representation and fed to the document. So whenever a data change occurs, render is called. Since it gives a lightweight representation, re-rendering is fast, and it's not necessary to define data bindings. It makes application development a lot easier.
Unidirectional data flow – As in Angular 1.x, react has no two-way data binding. With setState(), a component updates the internal component states. On capturing the object state (this.state), the updated version of the component gets rendered. The same applies to input(props). When an updated input arrives, the component gets updated through the render method. Therefore you don't have to modify the input or internal component state manually every time a change occurs. Thus unidirectional dataflow makes react much more predictable and easy to use.
Quick learning curve – react is just javascript and a portion of API. The stronger you are in JavaScript, the better you can be with react. I did find angularjs to react migration quite hard to adapt, but we love challenges and make sure you know why you are doing it. Once I got to know its functionality and the way of application, the speed improved gradually. React was quick ad easily maintainable. I found that I don't have to handle type-checking everywhere, despite its downfall, but you can always use TypeScript instead if you want or go with JavaScipt transcompiler Babel.
I guess a strong JavaScript foundation is essential if you wish to do an angularjs to react to migration. Also, if you want to get things done quickly and you're up for exploring and learning new stuff, react it is.
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