I use anyone that works. Sometimes beleive it or not i cant find what im looking for with google, but another search engine will serve exactly what im looking for up right away. sure it doesnt happen to often, but its good to have that choice when you need it
A lot of people use other SE probably because they just like using something they have been using for a very long time. Instead of switching to a new one, most people just stick with the old ones.