While this is not completely Black and White, one thing which favours Bing is that a user has clicked on a search result which is determined using his own intel

While this is not completely Black and White, one thing which favours Bing is that a user has clicked on a search result which is determined using his own intelligence. Google has assisted the user with that action. Bing is only correlating these two individual actions(search and click) by the user, to get some additional signals.