Bing advantage: Social integrations are stronger
Bing's results win in terms of the smoothness of its social integrations. The company's contracts with both Facebook and Twitter give it access to more social data than Google, which must rely on the lesser-used Google+ network. The way it integrates social recommendations into its SERPs is also much less cluttered than Google's results.
Bing's search results pages have a certain visual appeal. And it appears that there are plenty of people who agree.
In many ways, Bing's results look like Google's used to, before Google cluttered its listings with "+1" buttons, social annotations and other useless features.