Interesting, I've never heard those points before. They're both super fast for me, and give me really good results.
I was using DDG for many years, but the results were often super bad and I hadn't noticed until I started using Google search again. Then I started using Ecosia and Qwant, and the results have been sometimes better and sometimes worse than Google -- mainly only worse whenever I need Google Maps for its various features around businesses that OpenStreetMap is missing.