That really depends on your use case and how valuable web search is for your daily life.
I've personally tried Google, Bing, DDG, Brave search, and ChatGPT. Kagi is consistently able to find what I'm searching for more quickly and accurately than anything else, which has been very valuable for me in my personal and professional life.
It's easily worth the cost in result quality and time saving for me personally, but that doesn't mean the same will apply to you or anyone else.
As far as stand out features, there aren't really any that I can think of. It just gives me the results I'm looking for without any bullshit to wade through.
It was so disappointing, it would have been so easy to make it work with couch co-op and online multiplayer with just a little bit more effort. I was so excited when it was first announced, and then I don't think I played it beyond the first day it released after trying online play with my brother.
The original was a masterpiece of couch co-op, but it's increasingly difficult and expensive to play it on original hardware anymore. Fortunately you can get away with connecting multiple instances of m-gba and dolphin to recreate the experience on emulator for couch co-op at least.