Material ui is the most reliable react component library which i have came across on the web , it has lot many Ui components available readily for each and every need. They are very customizable components which can be modified as per our need. These components are built with google's Material Design so all the components come with the default google material design standards. Material Ui components have greater responsiveness so when building a web page it can proved responsiveness for all devices. It has a great documentation provided on its website which is very easy to understand for a newbie to getting started with the material UI components and build a fully responsive web application. Styling API provided by the Material UI is most helpful in writing the inline styling within the Component and customizing the component with overriding the existing stylings.

ease of use, a lot of different options and styles, all material design goodies implemented and ready to use with ReactJS, easy to understand API and examples, easy to override and make theme for your app. Great documentation and I've seen a lot of progress in last 2 years regarding the code quality and options Material-UI is giving me, community and support are also great and they response in timely manner.

Foundational styling, the amount of features out of the box, and the flexibility. I also like how there are extensions for React to make integration extremely simple. One of the greatest things about this library is the amount of components it offers out of the box. Almost EVERY UI component you can think of is styled in here. It's incredible. Another thing that is nice about Material is the documentation. All of their components are live within their docs and you can view/edit code snippets in real time to see results. It makes developing against this very easy. Lastly, I think some of the different styles that are offered for the components are modern and flashy. There's not really much you need to change out of the box to make your UI look great.