I find the differences are not quite as distinct as you make them out to be, and I wouldn't ever expect both search engines to be all that different either. Both companies are data-driven: an A/B test performed on Google is likely to produce results much like those of a similar test at Bing, and ultimately that's how these pages are built. That's why I think Bing is still trailing behind Google, they haven't had the time to acquire the same amount of data and experience.
As for the 'universal screen spam', ads at the bottom of the page with no search form, and multiple links to the same site, all of that I see on Bing as well. Try a search for New York and you'll get images, videos, temperatures and travel stuff. Make that New York Hotel and they'll thrown in a couple of ads at the bottom, too (where there's no search form). Now, each to their own, of course, and it's good to see the underdog improving itself, I just don't see anything huge going on here.