1. None. This simply returns the unformatted text - use it to compare.
2. Minify. This will minify javascript and css (not html). It uses the minifier from Microsoft (not my own).
3. One line. This will return a html page where javascript and css are kept on one line. Use it when you're primarily interested in the html.
4. Normal. This will prettyrize the text using a balanced form of expansion. You can then use Visual Studio (or what editor you use) to finetune the formatting.
5. Expanded. This will add additional spacing (and braces) in javascript and css. The output should be easier to understand with matching braces and space between words.