which one is better? Google search or Microsoft Bing?

google and microsoft is same company and doesnt matter what one you use because anyways it still will have the same stuffs . 

I still prefer Yahoo search engine.

Microsoft bing is better.

Both have their own pros and cons. Depend on your work. In my suggestion, you can go with a google search.

The one that ultimately works for your needs

Duckduckgo. Simple

the same , both rely on ads , the more you pay for the ad the higher in the ads list to show results first .

Both are merely spyware that tracks you and harvests all your info and sells it for profit to the highest bidder.

Get the "ghostery browser" or at least install the Ghostery browser extension on your existing browser

Neither. Try GIBIRU,MetaGer.org,Startpage,DuckDuckGo,Mojeek search engines instead for more security and privacy.

None.............