I also prefer Google as the Best search engine as my sites gets maximum visitors via Google and then from Yahoo and Msn.

I only focus on Google :)

Google, of course!

Mostly Google but I have to check others like Bing when I do web designs and follow up online marketing for my clients.

Google here as well. Great for the results it offers...

Google is the best one to target your site for optimization. If you will get benefits on Google in respect of ranking, Automatically you will get benefited on the other search engines.

Google and Yahoo

But I think google is the best search engine.

I always prefer Google to search anything as well as to do any thing for raising my rankings on SERP.

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I am using all three popular search engines for different use. I am using Google for web search, Bing for Article search and Yahoo for News and update. I observed that google gives higher weight age to web, Bing gives to Article and Yahoo likes NEWS.

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In general I love to use Google. But I am also using Yahoo for News and Bing for Article.