More that they have certain problem domains where they might pick a given search engine, and that those problem domains are biased toward using Bing for easy searches and Google for hard ones.
I'll frequently search for airplane tickets on Bing, for example, while I won't even go to Google for that. But when it comes to looking up obscure programming stuff, I'm not going to bother searching on Bing, I know it'll suck.
"More that they have certain problem domains where they might pick a given search engine, and that those problem domains are biased toward using Bing for easy searches and Google for hard ones."
That makes no sense. Why would you, or anyone, alternate with search engines if one of them too often fails to deliver? Why not just use Google all the time and avoid the cognitive overhead?
Does Google do a poor job, or a worse than Bing job, with airplane tickets?
I'll frequently search for airplane tickets on Bing, for example, while I won't even go to Google for that. But when it comes to looking up obscure programming stuff, I'm not going to bother searching on Bing, I know it'll suck.