I would be curios to that as well, I currently use duckduckgo the most. I have been getting more and more used to how it searches so I have become better with it. I still don't find it as good as the old google, but I honestly cant find what im looking for easily on google anymore.

I usually am researching obscure rare things that only a few websites in the world are talking about and before I could easily find it just by using the combo of key words in google. Now in my experience forget that, it will focus on one key word and give you every huge website that has used it in some article etc.

I lack the knowledge about the algorithms etc that they use, but as far as someone who searched a lot of things and used to enjoy googles actual search engine I just personally find its moving backwards.

Sorry I couldn't be more help :) If you have any good suggestions let me know!