My searches suggest the same too .. Bing is very good for images but not so good for search results weirdly ... that said I live in India so we dont have any fancy stuff that bing provides
In my experience, the Bing It On results don't reflect real world results of either search engine. For one thing, when you use them while logged in to their respective accounts, they will generally become more accurate as time goes on.
I find people choose whichever service they don't use on a day to day basis as the one that they are not used to appeals to them initially. That's why most people prefer Bing! Lol
I actually do use Bing as my default and Bing Rewards is awesome! (I've gotten $10 for just searching like I normally do in the past couple months)