The problem with DDG is that it is just marketing on top of Bing. It doesn’t improve the Bing search results in any way, adds no new features and has no ambitions to build its own index. Never quite understand why it got popular in the first place when you can just use Bing instead and get literally the exact same thing.
Kagi is much closer to Google, bigger index and more up to date results than Bing, it has a lot of old features Google removed over the years, it removes a lot of the SEO spam that fills up Google and so on. It feels like modern version of Google without the enshittification. And yes, you can find most of the sites in any other search engine just as well, everybody is searching the same Web after all. It’s not magic, it can’t fix everything that is broken with the Web, but Kagi is a much cleaner more user focused experience.
What makes Kagi interesting in the end that going from Google to any of the alternatives always felt like a downgrade, Kagi is the only one I ever tried that felt like an upgrade.