It’s much more privacy oriented. I am a huge advocate for data diversity in that I don’t think one platform should have your email, search history, passwords, fitness watch data, photos, etc. (Fitbit is owned by Google btw.) The main reason I use DuckDuckGo is well, it isn’t Google. It’s got decent customization options but, well, it’s very simple. I don’t have to mess with things I don’t want to. Simple enough to switch the engine in a few clicks on any browser or to download their dedicated app (which has fun features like one click cookie/history clearing, something I think should be done regularly.)
I find the search results to be more relevant too, and less full of SEO-optimized AI crap, i.e. something that does well in search rankings but has little useful information. Google has a lot of that. It does have AI summaries now but it can be turned off.
Don’t use Chrome as a browser either. Also a google product. Unless you want to use another email host like ProtonMail and then use Google for web searches… that’s personal choice, I like gmail enough that I would rather use an alternative for search engines.