Google is no doubt best search engine around but if you lot of searches everyday you will realize that in certain queries Google is not a good option. Moreover, if you are concerned about full privacy than there are better search engine solutions around.
The other best thing about DuckDuckGo is that it ‘Bangs‘. Bang is used for exclamation mark by programmers. Bang is very useful feature, you can search websites with their internal website search engine, for example if you search with !amazon it will trigger product search on amazon website, !yt will trigger youtube search. Similarly you can do amazing stuff with many websites and services. The best thing about DuckDuckGo Bangs is that you can trigger searches for specific program languages like PHP and Python with !php and !py respectively, this makes DuckDuckGo programmer friendly search engine. A full list of Bangs can be found here for reference.