A core difference here is the contextual and semantic understanding of the code. The way we search and rank ties into alot of coding metrics and semantic parsing of the code around the web using the new 'Roslyn' C#/VB compiler-as-a-service technology.

Most other experiences base their search algorithms on search engines / textual matching / rely on the host web site's search accuracy, where as we combine search engine smarts with semantic and contextual analysis.