I tried both and use Perplexity. Perplexity is much more akin to native ChatGPT in which I can create "spaces" for my projects. For example, I just bought an RV and so I loaded up all of the PDF manuals into a space so the LLM can reference those things. Since a few months ago, Kagi is just thread based.

FYI - I use Kagi every day for standard search and love it.

Perplexity aggressively makes shit up, particularly when it comes to science and finance. It provides sources, so you can check the bullshit, but I’m the error rate is so high that it’s practically dangerous.