My initial preference was Less, because sass seemed framgmented with 2 syntaxes, and also less seemed more aesthetic, but I ended choosing Sass for the following reasons:
* Sass has Compass built over it http://compass-style.org/docs/ and this alone is the biggeast win over Less
Compass is a framework that comes with a foundation of components :
- compass core http://compass-style.org/docs/reference/compass/
- many plugins for different needs (search github for compass), special mentioning Susy liquid grid framework https://github.com/ericam/compass-susy-plugin
- with Compass I can monitor a whole directory of templates at once, and have them instantly compiled when I save from the editor, not sure if Less can do this
* Aptanta Studio 3 and few other IDE's know to syntax highlight sass and scss, not sure about less
* If you don't like the indentation syntax you can use the curly Scss, Scss and Sass are interoperable, you can call one from the other and vice versa
* The ruby version of Less is deprecated and I write a ruby based project (indeed, not all HN users are pythonists) Moreover, I don't like the idea on compiling the templates client side (as in less.js) and waste precios miliseconds, nor use an external interpreter (node.js)