I use DDG as my primary search engine, so I prefer the bangs as it fits my flow. I search in DDG and if I come up with nothing I go to the search form and add

I use DDG as my primary search engine, so I prefer the bangs as it fits my flow. I search in DDG and if I come up with nothing I go to the search form and add an appropriate bang to the front of my keywords and voilà, no need to re-type my query.