My experience has been that DDG produces satisfactory results 95+ percent of the time and Google produces more ads that crowd out the results 100 percent of the time.
It depends very much on where you live. Localized results outside of the US suck with DDG. Yes, you can set a language but you always have to set/unset it and even then it's not great at providing results that are relevant to a specific location, even if specified in the search query.
On the other hand that's no wonder, from all search traffic I've seen, Google tends to crawl 5-10x as much as Bing (DDG bot is basically non-existant). Google's index is much broader and more current than others because they crawl basically the whole web constantly. It's no wonder that Bing lags behind Google if they crawl everything apart from the most popular pages irregularly.
I've been using DDG for a couple of years. It produces satisfactory results as long as I describe what I'm searching for thoroughly. Google knows me well and is able to surmise a lot from a much shorter query.
In the same vein, if I want unbiased results, DDG is strictly superior to Google.
That used to be true, but Google search result quality diminished significantly in the past couple of year, because it started to get too creative with keyword dropping and substitution. I often see the single most important keyword in my query dropped to produce more results, or replaced with a more generic category (e.g. "Linux" replaced with "Unix"), or even replaced with something that's not actually a correct substitute at all (e.g. "FreeBSD" replaced with "Linux").
