When comparing CSS-Crush vs cssnext, the Slant community recommends cssnext for most people. In the question“What are the best CSS preprocessors/postprocessors?” cssnext is ranked 5th while CSS-Crush is ranked 14th. The most important reason people chose cssnext is:
cssnext is a PostCSS plugin, which makes it pretty easy to use for people who are already using PostCSS.
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Pros
Pro Out of the box vendor prefixing
Rather than require a plugin, CSS-Crush will automatically add vendor prefixes.
Pro Implemented in PHP
PHP is used in common platforms such as Drupal and Wordpress, which results in CSS-Crush being easy to integrate with most development stacks.
Pro Built on PostCSS
cssnext is a PostCSS plugin, which makes it pretty easy to use for people who are already using PostCSS.
Pro JavaScript-based
Because the parser/compiler can function in a web browser, it can be used with systems that cannot run similar technology on the server. For example, you could build a WordPress plugin with a front-end application that transforms CSS.
Pro No need to learn a new syntax
Since css-next only adds new CSS features in a way that all browsers can support it, it's still CSS. So there's no need to learn any new syntax.
Cons
Con Not widely used
CSS-Crush is not a widely used option. The small community of users results in a harder time finding answers to any questions you may have.
Con Lack of support in IDEs
Currently there is very little support for syntax highlighting when writing PostCSS plugins.