After two years working with Angular I was assigned to a project where the frontend stack was React, Next.js and Chakra UI. I started without any prior React experience nor knowledge. After three months in this project Ive decided to put my thoughts of this technology change into a post.

Disclaimer: this wont be a full Angular vs React post, but my thoughts about what I like and dont like about React, what I miss from Angular, etc. Also take into consideration that Ive only been working with React for 3 months.

From a Framework (Angular) to a Library (React)

This was one of the biggest changes for me, Angular already provides you a way to do things, elements to help with authentication (Guards), endpoints handling (Interceptors), Routing, Pipes, tools (such as the beloved Angular CLI), etc.
As React is just a library, its on you to generate all those things, or to search another external tool or library.

In React most features must be created from scratch

Lets suppose that we need to show an alert on our application every time an endpoint returns an error.
In Angular we can just go to the CLI, create a new Interceptor with the logic of reading the error and calling an alert, then use the interceptor from the app.module and we are ready to go.
On the other hand, React doesn't provide us with built-in magic to do this. We could use Redux-Saga, create an architecture for it to be reusable, think everything from scratch.

Routing

Since I havent worked with pure React, but with Next.js, Im going to compare its routing system to the Angular Router.
Nextjs handles routing based on the folder structure inside the pages/ directory, this is very easy to learn and doesn't need any configuration at all. For simple projects I look at it as a great advantage.
I consider that the Angular Router is a much more powerful and versatile tool, with it you can handle Lazy Loading as you need, and redirection is much more easy than in Nextjs.

Architecture

In my case, I dont have a lot of experience in development and even though I was able to start several Angular projects by myself and not die trying since it provides you a way to organize directories (even though you can customize it based on your needs).
Oppositely, if I had to create a relatively big application by myself with React in this moment of my career, it would be very painful for me to create something well organized and scalable (now that Ive worked on a project with a lovely architecture created by very experienced React developers it would be easier for sure).

Javascript after Typescript

Before I started working with React, I loved TS and I thought that it was a must to have within any application. I learned that it isnt correct, you can work in a very well organized way by using only javascript and a good Text editor or IDE. Also, if you dont use Typescript well, it can become a real pain in the neck.
I dont think Typescript is useless, I still believe that there are many scenarios in which TS can be a real lifesaver (really big projects, or projects with a lot of different entities).
Another thing that Ive noticed when using React is that I had to learn much javascript, ES6 syntax is a must, also I wasnt used to work with .map or generator functions. (This can be also because in this project Ive worked with real javascript lovers)

I really miss the Angular CLI

The ability to create any element you need (Module, Component, Service, you name it) in a single prompt command without having misspelling errors in the code is a real time saver, also by using it, you dont have to worry about the file structure, which imports you need, etc.

Simpler files

If you create a new component in Angular, by default it creates three files (and a fourth one if it`s a module) one for the template (HTML), one for styles and the other one to handle all the logic. You can reduce it into one sometimes, but I think that React, by using JSX, handles this in a much more efficient and cleaner way.
Also, by having less files, the project is more maintainable, cleaner and less intimidating to new developers.

Learning curve

I had heard that Reacts learning curve was smaller than Angulars, but I didnt understand why until I started with React. If you had to create a simple website with few pages, with React it would be very easy and simple as you dont need to know a lot of stuff. On the other hand, to do that on angular youll have to learn first: Typescript, Routing, Modules, Services, Interceptors, Guards, Pipes, among others things you may need based on your needs.

Conclusion

I still have a lot to learn about both technologies, but now I know that both have pros and cons, different use cases and it is not one or the other. The next time I have to create a new project Ill surely be doing a deep research and evaluation before choosing between Angular or React (or other frameworks or libraries that I havent tested yet).
I hope this has been in some way helpful for you. May the force be with you.