16 major categories. One could reason that a more popular site on a given topic would be so because it is good, well organized, etc. Reviews tend to be a paragraph long and focus on the visuals of the site and less on what you will find there. The most comprehensive set of reviewed sites available, around 75,000. Split into 26 subject categories and using a five star rating system.
Reviews tend to be longer than most.
Includes 16 categories. Descriptions are not really reviews, they tend to be shorter and focus on the content of a site. Unique categories within categories interface which makes the search through a directory more visual and understandable. 23 editors provide one line descriptions for sites.