I've been using Kagi since the beta, and used DDG for years before that. I would not switch to Kagi for search result quality. It is fine, but has never blown me away. I would switch to it for privacy, for not being the product, and for certain UX features they support but Google never would (like being able to map reddit.com -> old.reddit.com, or being able to block or downrank content from search spam sites like Pinterest)