Not OP, but I copy my reply from the last time someone asked an opinion on kagi:

I use it, but to be honest I did not do a comprehensive comparison. I like it mostly for the fine grained website control. For work and some personal stuff I often look for code and can push websites like GitHub to appear more often. Or I can block Pinterest in my search results. I tried to do this in SearXNG, but this was too much of a hassle so in a way I pay kagi for convenience. I recently got a new job and will evaluate in the coming months if it is still worth the money, but right now I am satisfied. Nobody else I know would pay for a search engine, so I can understand the stance, but I am really fed up with all the advertising and enshitification so I thought why not give it a try. And yes, because it was recommended here.