Garuda is very, VERY similar to CachyOS. They are both gaming focused, Arch rolling releases, have their own modified kernel, have their own repos, both set up proprietary Nvidia drivers by default.

I haven't spent a lot of time with Garuda, but I've found CachyOS to be an improved version of what it is trying to do. It has a bigger community, better gaming performance in every benchmark I've seen (they've also had a few bugs lately that have made Fedora benchmark better than Garuda), better general Ui responsiveness (and if you use Garuda's Dragonized Desktop it's even heavier than GNOME). I also don't like that Garuda enables Chaotic AUR out of thr box. This allows random third parties to compile binaries for you, instead of building from source. This takes a lot less time to update if you have limited hardware, but you're also probably not using a bleeding edge OS if you have old hardware. AUR is already dangerous, no need to add Chaotic AUR where you can't even be sure that what code is being executed on your system is what is described in the package. Lastly I like Shelly a lot more than Pamac, I couldn't even get Pamac to manage Flatpak last time I tried it, and Shelly easily manages every possible package type with ease and matches KDE's theming better.

That being said, Linux is Linux for the most part. I did make this meme making fun of other CachyOS users for thinking the performance boosts are so mega important.