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.
DuckDuckGo. Its results are much better than Google's in my experience. Whenever I Google something, all I get is a list of online stores I've never heard of, and they have nothing to do with my search input.
For me the main thing that makes me stick to DDG is the bangs - adding for example !wiki in the beginning of a search term to search directly in Wikipedia. It is a game changer, especially as I often need to search in specific sources for work. For example, !scholar for direct access to Google Scholar is great.
Whenever I think Google will provide better results it's as easy as !g - but I am also experiencing that the results are increasingly unhelpful (often geared towards shopping rather than information).