When comparing mini.css vs Pure CSS from Yahoo!, the Slant community recommends mini.css for most people. In the question“What are the best fully-featured responsive CSS frameworks?” mini.css is ranked 3rd while Pure CSS from Yahoo! is ranked 9th. The most important reason people chose mini.css is:
This framework is under 7KB and really does the same that Bootstrap does as good, or better.
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Pros
Pro Lightweight
This framework is under 7KB and really does the same that Bootstrap does as good, or better.
Pro Modern
Pro Easy to customize
Has an extremely minimalist look that is super-easy to customize since it basically gives designers just a foundation on which they can easily build their design.
Pro Cross-Browser compatibility
A solid base built on Normalize.css to fix cross-browser compatibility issues.
Pro Lightweight
Extremely small file size: 4.5KB minified + gzip.
Pro Responsive
A responsive grid that can be customized to your needs.
Pro Works well with Bootstrap
Easily use Bootstrap CSS and JS elements within the framework.
Cons
Con Archived
Git repo has been archived so it's pretty unlikely to receive bug fixes or new features
Con Not suitable for beginners
Since Pure CSS only carries a minimum number of styles out of the box, it might not be great for beginners who want a complete style that looks good out of the box without having to customize it.