When comparing Skeleton vs Material UI, the Slant community recommends Skeleton for most people. In the question“What is the best CSS framework?” Skeleton is ranked 5th while Material UI is ranked 14th.
Ranked in these QuestionsQuestion Ranking
Pro Responsive grid
Pro Style agnostic
Pro Vanilla CSS
No bells and whistles for Skeleton, it's just CSS.
Pro Media queries
Pro Perfect for React projects
Really convenient and easy to use components
Pro Adheres really well to the material design standard
Really nice implementation so far
Con Not maintained anymore
No active development for two years.
Con Active development means API changes are frequent
Might be a problem for large projects, but since active development is a good thing, you should consider this rather mild inconvenience weighed against the benefits.