Sorry x3mario ! you may haven't the observe the difference but i think yahoo image search is far better than google, it just that google has huge database of website, and almost every website that exist, is also listed in google, which isn't the case for yahoo.
I personally use google, when i have to search some content and use yahoo when i have to go for really quality websites(big names, big companies, big forums etc) not just looking for content or material etc.

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