I’ve been using ArcoLinux i3 flavor for a while, but they recently discontinued their flavors and instead just let 3 basic flavors, but as far as I know none of them comes with i3 already preconfigured. And yes, I know I can simply do it by myself with Arch Linux, but I don’t have enough time to do it.
I have already tried Garuda Linux i3 flavor, but there’s something in it that feels too mature to be user-friendly.
EndeavourOS has an i3 version. That’s how I started i3, and I’m still running it after almost 2 years. Comes pretty well set up in my opinion.