Kagi basically won me after I realised I can exclude whole domains from search results - now Pinterest, Stackshare and all those AI-generated content filler sites are gone from my search results. Search results are great and it's just worth it.
The only advantage Google so far has IMHO is location-aware search. For certain keywords (like "gym") it feels like Google better looks for results that are within your area, whereas Kagi needs some more input (like a city/district name).