Joined March 2013
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Stylus supports every form of conditional and looping evaluation that Sass does, contrary to a post above. However in my view, Stylus has some weaknesses due to its ultra-stripped down syntax, which raises ambiguity issues in the parsing. I've seen bugs due to this such as problems with certain cases involving pseudo-selectors, and they are super hard to pin down.
On the other hand, Sass is the most robust and stable of the three, despite the syntax being less cool. And the killer, underappreciated feature as of Sass 3.2, is placeholder or "extend-only" classes, which are a game-change for CSS frameworks.