I still have DDG as the default because it does work a lot of the time, and because it's easy to turn a search in to a Google search with !g, but I have to admit it's not all that good in comparison :-( To be honest I'm not sure if I would keep it as the default if it didn't have !g, and that's not a good look for DDG :-/
(I appreciate this is a very hard problem btw, so not even intended as a dig at DDG; just my experience with it)
Google seems to be filled with sponsored results that are only superficially relevant, and from page 2 onwards, it sometimes feels like whatever it’s giving me isn’t related to my search at all. Even when I’m very specific with my query, using +/- and quoted phrases.
I wish I had taken some screenshots, here's the only recent one I have: https://i.imgur.com/b9hu2a9.png – I was trying to find about Cambodian date writing conventions for some i18n code, but all DDG gave me was spam (and most likely, scam) results. Probably not the best search term in the first place ("Cambodian calender" would be better), but it's a decent example.
I should keep a spreadsheet or something, but I'm too lazy for that. And it's not really all that interesting either.
(What I actually wanted to know is how widespread usage of the Khmer calendar is, and if I could get away with just supporting Gregorian).
Maan Leo is a Dutch author. DDG gives me a few bad results about Maan Leo, a few bullshit links about horoscopes ("Make a Leo man chase you"), and finally the Wikipedia page for Low Earth Orbit (LEO).
The Google search gives me results about, well, Maan Leo (in spite of using Indonesian search by the way – this GeoIP stuff Google does is so annoying). For this particular term, DDG is basically useless.
The Brave search results also seem a lot better by the way. Certainly loads better than DDG.
Occasionally I try google search to check and I virtually never think google's results were better. But I'm guessing a lot of that is down to how you do search-fu, what you're actually looking for and subjective stuff about ranking quality.