Sass or SCSS ?

From the sass docs

There are two syntaxes available for Sass. The first, known as SCSS (Sassy CSS) and used throughout this reference, is an extension of the syntax of CSS3. This means that every valid CSS3 stylesheet is a valid SCSS file with the same meaning. In addition, SCSS understands most CSS hacks and vendor-specific syntax, such as IE’s old filter syntax. This syntax is enhanced with the Sass features described below. Files using this syntax have the .scss extension.

The second and older syntax, known as the indented syntax (or sometimes just “Sass”), provides a more concise way of writing CSS. It uses indentation rather than brackets to indicate nesting of selectors, and newlines rather than semicolons to separate properties. Some people find this to be easier to read and quicker to write than SCSS. The indented syntax has all the same features, although some of them have slightly different syntax; this is described in the indented syntax reference. Files using this syntax have the .sass extension.

http://sass-lang.com/documentation/file.SASS_REFERENCE.html

SCSS is the newest bestest version of Sass, it is short for Sassy Css. Use that one. Sass is an older version.

sass vs scss

scss doesn't end with semicolon

I prefer semicolons. I used to not like them, but I feel naked without htem. Lol ;