Yeah I actually prefer stylus to sass personally, sass is just more popular (and rails default) and less magical for people that don't work with css as often.
My favorite feature actually is that it can grab properties out of parents, as demonstrated here: https://gist.github.com/2563746
My favorite features:
- auto-insert vendor prefixes, even IE filters (no need for css3 'mixins', which are most of the mixins the avg dev will need)
- can even rasterize linear-gradient backgrounds and serve as image for more pre-css3 browser support. This one I haven't tested but it sounds awesome
Edit: paragraph formatting