Several reasons why Bing doesn't measure up to Google
#1 - Basic search results are not as accurate. When I search for part #s or error codes, Google always has the most relevant stuff at the top. With Bing it's usually at the bottom of the page.
#2 - Google Now cards. These are a game changer. When you search for a person/place, Google presents a full profile card with photos on the right hand side. Bing does not have this.
#3 - Sports results. If I input an athlete or team, Google will give me their most current results at the very top, Bing does not do anything.
I did Bingiton.com yesterday and Google won 5/5 rounds.