When it comes to realtime buyer traffic, Yahoo tops both Bing and Google. For years, Yahoo has produced the larger sales. Sure .. you can get a ton of traffic from Google, but how much of that traffic pays? Using adwords or adsense doesn't count. Google knows that their traffic doesn't pay out as well as Yahoo's .. it never has .. So Google came up with ways to attract people and webmasters by way of subsidies (a form of financial assistance paid to a business) .. i.e. Googles ad programs. I don't use Google subsidies .. my money is made off of the internet the old fashioned way .. I work for it. And so far, since 2002, Yahoo has been the clear winner in returns on my internet investment.
I don't believe this google also send lots of buying traffic. May be this is only case with your niche. By the way on which niche you are currently working.
Yes, Bing is cool.. UI is awesome.. Some other features like Travel, Shopping, Video search, image Search, Visual Search, Twitter Search are amazing and innovative...