Proof is that even though we ca have some knowledge benefits from yahoo , i suggest to use google because , once i was using yahoo. No doubt it was good. But not always. Yahoo is not having special features as google and google has facilities of apps like finance, work, maps, play store, blogger, keyboard, search engine, gmail, news and weather , translate, voice, calendar, camera, hangouts, , earth, drive, youtube, inbox, spell check..... And many more. Thus this proves that google is better than yahoo.