I'm curious as to where it lacked. DDG works more than well enough for me, but I'm wondering what other people search for where it is not.
Don't get me wrong, DDG works fine for me for 90% of my search queries (which are usually quite straightforward). But I have noticed a difference in quality vs Google, at the margins. I'm considering trying out Kagi.
I have been using Kagi for four months now, and can happily report that I resort to it less and less, and even when I do it is mostly due to muscle memory from years of DDG.
When DDG fails, I just re-run the search with "!g" and it goes straight to google and I'm good.
For truly rare and unique searches, Google undeniable has a bigger index, so cases where searching for a unusual error code 0x004104010 give you nothing on DDG, Google could find one poor soul in an obscure Korean forum, that solved the same issue and then translate the result, just enough for you to recover your broken data.
But I'd say with Kagi it's almost the opposite - it finds things at least as well and there aren't ads to get in the way. It feels like old-school Google.
I actually found that I was getting annoyed on my mobile devices because they were still searching on Google and I need to scroll past ads etc., before I recently switched them over.