Which is the most easiest and relevant search engine?

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I feel that there is unique features for each search engine.I feel that Google has special features like more relevancy and faster search with more search results.Yahoo on the other hand has astonishing home page with more links of search.Msn is interactive and offers an live search.Ask and search.com are other sites which are famous along with these three giants of search.Google has more special features like adwords,adsense apart from search.