Sass vs LESS ( CSS Preprocessors )
Sass is the most mature, stable, and powerful professional grade CSS extension language in the world.
Sass is completely compatible with all versions of CSS. We take this compatibility seriously, so that you can seamlessly use any available CSS libraries.
Sass boasts more features and abilities than any other CSS extension language out there. The Sass Core Team has worked endlessly to not only keep up, but stay ahead.
Reasons why you should learn Less
Less came to the scene after Sass in 2009. Less stands for “Leaner CSS”.
Setup (may) be easier
Obviously, this is inefficient. However, if you’re just playing around and testing out the Less waters — this method will do.
Now, with both Sass and Less most designers/devs will use the command line to compile their files into CSS.
But if the command line terrifies you, fear not. There are a variety of GUI compilers available.
One last thing to keep in mind when setting up either on your machine: