Maybe when the first time I ever used internet, Yahoo was the best. But now, Google rules.
I give you example why Google is better.
I want to search images in Yahoo. I use the keyword "cervical disc herniation, CT scan".
and I only get 1 result.
Compare to Google for the same keyword..
I get 3250 results! What do you think?
Another example, I use keyword "hangman's fracture MRI",
and I get no result.
With the same keyword again, but this time I use Google.