This has been a a tough one, Google gives all ad-focused results, and DuckDuckGo gives crap results (imho)
I did find Kagi recently but they charge after 100 free trial searches, and I'm considering paying for it because it's so good. Best results I've gotten anywhere in a long time.
I use kagi and really like it. I find it worth the money as a business owner and software dev. I feel I'm more productive.
You can set up your own "lenses" which are targeted, customized searches and then use a keyword to invoke them. Pretty handy when you routinely search for obscure topics.
The ability to prioritise and pin results from different sites is what won me over. Pinning stackoverflow helps filter a lot of junk when resolving programing issues, and when working with geometry I've pinned or prioritised a few different resources that better explain the mathematics