Google algorithm is known to be much better than of any other search engine. This is because it favors quality content over well-established links and pages unlike Yahoo which still prefers old and well established websites. ... Both Google vs Yahoo offer different benefits.
It is true that Google search engine is very powerful and has many extra features which other might not have to that extent but we can use others also with almost same ease. The fact is that once we are attached to one particular search engine we feel easy to operate in it and continue there only. I am using Yahoo most of the times.Knowledge is power.
It all about the preference. Once your addicted to some step then you follow them often. Although Google search is much powerful then other but people use yahoo and bing for there benefits. Also bing is windows integrated search so many people use it. I use bing several time in a day as its part of windows search in your task bar.