Preference: Less vs. Sass vs. Stylus

Hi all front end web developers! What CSS preprocessor do you like the best and why?

Also if you are using Sass, what syntax do you use?

I'll start. I use Sass because of Compass and the fact in has the best community now IMO. Popular web developers recommend it too, and Foundation 3 uses it.

I use the Sass syntax instead of the SCSS syntax because it is simpler and python-like.