Do any of those search engines contain spyware?
Google is free of spyware. It gives you the option, when you install, to avoid installing features that report your web use back to them.
Or you can install all the features, which I do, and then go into Options and clear the two check boxes under Page Information, which are the features that return information to Google. I don't care if Google knows what pages I visit, but sending the information slightly slows your browser.