What exactly are you looking for in a testimonial? Do you want a side-by-side comparison of results or something?

My experience has been that Kagi's customizations are the key selling point, allowing you to block and bump domains to meet your needs:

* I have Wikipedia pinned, so if there's a Wikipedia article it's always the top result, whereas Google has lately started downweighting Wikipedia much of the time (as a simple example see COVID-19).

* I have Pinterest blocked entirely, so I never see results from them. As an example, try "living room refurbishment ideas".

* I have MDN upweighted, so it tends to rank higher than random people's blog posts for web dev queries.