Data on search engine market share is available, but I wonder what that looks like for Lemmy users in particular, who I would assume lean more technical than the average user, so probably use DuckDuckGo and alternates more than Google.
I use a mix of DuckDuckGo and Kagi. I'll also use ChatGPT, which can be good if you're careful to verify the answers it gives you as a check against hallucinations. It's useful for short, direct answers without ads or SEO bullshit.
I tried DuckDuckGo for quite a while, but I consistently failed to find things that I knew existed, so would switch back to Google anyway.
example: I am publishing a serial over on Royal Road, and one of the things an author there with any amount of traction does is search for links and possibly re-hosts of their materials. Links are fine, but re-hosts are obviously a no-go and you want to report sites that do that and/or take other measures. Google would find sites tracking and linking when I searched, but DuckDuckGo did not find any of them.
Heck, DDG didn't even find most of the tech sites that my title happens to overlap phrases with. ("No Need For A Core?" manages to trip over conversations with server cores, which is hilarious for a high magic fantasy series). I just can't trust that it finds enough stuff.