In my experience, DDG search results are worse, not better, and people who say otherwise are mental or lying.
I discovered the other day that DDG uses Bing for image searching because without safe searching enabled it randomly returns tons of pornography for innocuous searches like "filled torus".
Doesn't DDG rely pretty heavily on Bing period? I am under the impression that they are returning (maybe slightly augmented) Bing results for pretty much everything.