Roughly speaking, the size of an application corresponds to the number of functions it provides. But technically a small, medium, or large single-page application can be built with either Angular or React. So how can you decide which technology to use? The answer is very simple: if you want a MVP with only basic features, then AngularJS 1.x will suit much better than ReactJS. This is because AngularJS is a framework that contains all necessary parts of the MVC stack to help developers produce a fully working SPA right away.
But what happens when we continue adding new functionality to our AngularJS application? AngularJS will constrain our efforts because of its rigid architecture. Developers will have to work around technical limitations of Angular at a much earlier stage than they would with with ReactJS.
ReactJS is great for creating simple single-page applications, but is a practical choice only if those apps will grow larger in the future. The flexible architecture of ReactJS allows more changes during web application development. The main issue with ReactJS is that it offers little functionality out of the box, which increases time spent on the pre-development stage. Therefore, if your final application will be relatively small, it probably makes more sense to develop it in Angular, as the extra development effort required with ReactJS will be of no benefit.
Now we’ll take a closer look at the development speed with Angular and React.