I recently decided to give Bing a chance to impress me and it did. However, today I switch my default search back to Google. The reason is not because it's a better search it's because it's a bigger search.
While developing I am always hitting errors and problems that are usually answered with a quick search on the web. Bing does a good job of this as does Google. However, about half of my search is done on Stack Overflow because that's where the answers to most of my questions lie.
I use the "site:stackoverflow.com" directive with the search term(s) when searching the site. If you use the site:stackoverflow.com directive without search terms then you get an interesting result which is the number of pages that that search engine has indexed on that site.
When I do this with Bing it tells me that it has 29,200 page in its index. When I do this with Google I discover that they have indexed 1,240,000 pages on that same site. That means that Google have 42 pages (if rounded to a whole number) for every 1 page from Bing and if you've read the Hitch Hiker's Guide to the Universe Trilogy (a trilogy in five parts) you will know that 42 is the meaning of life, the universe and everything.
That aside, the chances of me finding that needle is 42 times higher on Google than it is on Bing.
Sorry Bing, you have to go...