So I did a little test of my own. Now I am a big Star Trek fan, that's no secret. and I used the 3 big search engines, and DuckDuckGo.com, here are the pictures of my results when I searched, "Who is the better Captain?"
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In the 1st picture you see the results of duckduckgo and google. In the 2nd Bing.com and Yahoo.com. I didn't say anything about which "Captain" I was looking for, it was a pretty generic question so just about anything could have come up in the search. Well with out tracking or putting me in a bubble, I get things like "Captain America or Batman" or "Dhoni or Dada", from DuckDuckGo, Bing and Yahoo. But Google putting me in a "Bubble" gave me results that are more suited to my interests. Namely "Captains from Star Trek" and then four or five results down the page I got the results that were like the other engines. In otherwords, google put what it thinks I might be looking for near the top of the results, based on websites, or other searches I have done, but it didn't exclude the results I wasn't looking for.
Where in duckduckgo I had to search the results for what I was looking for. I want to be put in the "bubble" I want results that are much more to my interests then non-relative results.
OK, so what are the results if I change the question "Who is the better captain Kirk or Picard?"
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This time the results for all four virtually identical, and on Yahoo and Bing they appear to be identical. What does this prove? Well in my mind I can't just use a generic search on duckduckgo, I have to be pretty specific about what I am looking for. While on Google I can be a lot less specific about what I am searching for, and the results will be sorted in an order that makes since and still will show results that may or may not have anything to do with what I am really looking for.
Google has it right!