That test only compares the result links. It's missing a significant chunk of the experience: autocomplete, instant results, highlighting, social results, best-guess results, calculator functions, etc. It would have been a decent blind test maybe ten years ago.
I find I tend to always select Bing based on that search. Perhaps the way I write search queries melds better with Bing.
Generally though I use more specialized search engines for my day to day work and with things like DDG and !bang syntax I can get to where I need more quickly.
Nice. Definitely, an easy way to compare. But the yahoo column seems to be not working.