Material UI is a library of React UI components that implements Google's Material Design.
An enterprise-class UI design language and React-based implementation. Graceful UI components out of the box, base on React Component. A npm + webpack + babel + dora + dva development framework.
Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.
It provides prebuilt Bootstrap 4 components that allow a great deal of flexibility and prebuilt validation. This allows us to quickly build beautiful forms that are guaranteed to impress and provide an intuitive user experience.
It has a rich collection of components that would satisfy most of the UI requirements of your application like datatable, dropdown, multiselect, notification messages, accordion, breadcrumbs and other input components. So there would be no need of adding different libraries for different UI requirements.