this is not a simple question buddy... google gives fastest results and download links pages as well and far better than bing in this concern but recently bing has launched a unique search style with images trying to leave google behind ... but only trying..
the reason why google is over bing is that bing copied the basic idea of google, do you remember how msn search used to be. It was google which revolutionized the searching world.
google cared for the users, MS cared and still cares for the business and profits, thats the reason,.
A. Google has a huge market share B. It has/uses better algorithms C. Its been in search engine business for years.
I don't think so. The big problem with bing is crawling frequency, it took long time to crawl pages. Though it is my personal experience coz my wordpress article usually indexed by google in 1 or 2 minute. And bing hasn't indexed a single page in that blog. My site in google - 2350 pages. In bing - 1 page till yesterday, today 17 pages.