My rule of thumb that I’ve found is that for the most part Kagi is on par with Google for anything non location-aware. Oftentimes it’s noticeably better actually since there’s less pumping of useless results to the top. For anything location-aware, however, it ranges from significantly worse to steaming hot pile of garbage depending on the search.
That’s what eventually made me cancel. Loved it for what it does give but found myself rather annoyed about having to switch to Google to get actual usable results on the significant amount of location based queries. Never got into the habit of using bangs unfortunately.
FWIW DDG is flawed in nearly the exact same way.