The search results of Bing seemed very similar to DDG. It seemed to do a mediocre job if figuring out the context of my search. Google seemed to figure out the question behind my query. With Bing the results seemed to feel more like a regular text search where it matched the words I was searching for to semi-random websites. Perhaps google has so much search traffic and they check which links people click on for different searches, so they are able to adapt to put more useful results closer to the top for a given query over time.