I would go for google. update, easy to use, comfortable. They provide a better service of yahoo, I think but still use yahoo.

Most of them optimize their websites for Google search engine than Yahoo, because we get more traffic from Google.

Yes, the Big G or the Google search engine is what I really have to be choosing these days as the results that I can get out of it are really relevant and accurate.

Optimisation techniques don�t differ from search engine to search engine. If you have worked on your on-page and off-page optimization part correctly.

The ethical strategies of the major search engines are all given for you and you just need to follow them to get the best sites and ranking.

i am fully agree with serena