Interesting. I tried both and now use LESS with the More plugin in my rails app. I'm a huge fan of HAML, but I haven't fallen in love with SASS yet. The big upside to LESS is it still looks like CSS. Compass is interesting though, from the SASS side. http://github.com/chriseppstein/compass
The latest version of Sass (3.0) has CSS syntax:
The compiler supports both variants - the file extension (.scss vs .sass) denotes which you want to use.
