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.
DDG for everyday usage. Sometimes I try searching the same things on google just to compare results. I've tried searxng instances on and off in the past but its rarely been reliable for me and self hosting isn't really an option for me.