Which is a better language translator google or yahoo babel?

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I try to make friends with all people of other nationality. I try to reach them out through proper communication. I found out that google and yahoo have their own translator tools. Have you ever test this tools? Which language translator works best on you? I notice that google have more languages translate in different languages and when I try to type a sentences, such as in English translate to Spanish. The results is compare to Yahoo babel and in google. The results is not similar and translate differently. To test this effectiveness, I try to write to friends using this tools. They response well..What could you say, have you ever try to test it ?