Chris Coyier wrote a nice article detailing some of the details http://css-tricks.com/sass-vs-less/ http://css-tricks.com/sass-vs-less/ The single biggest diff

Chris Coyier wrote a nice article detailing some of the details http://css-tricks.com/sass-vs-less/ http://css-tricks.com/sass-vs-less/ The single biggest difference is in available style libraries in my opinion. I could probably never use Less because my workflow has become so heavily intertwined with Bourbon, Susy, and Compass.