Debian testing exists. It's just not well promoted or publicly presented for that matter. But it's not really any further behind than Ubuntu.

Also open suse tumbleweed. Is great. When you want something more up to date than fedora. But don't want large chunks of your operating system to stop functioning randomly on an update like Arch. Because they pushed an intentionally breaking change, but nothing to fix it. And you happened not to read all 1000 change logs for the update, missing the relevant one.

I love Arch, but I wouldn't touch it for desktop these days. I seriously don't have the bandwidth to read 1000s of change logs every couple days. On an appliance or server? Sure. Most recently VLC stopped playing mkv files. Why?! A packaging change. Instead of a few large packages/dependencies. They were all broken out granularly. Which is fine. But since you didn't have all the new packages installed before. All functionality moved to them just went poof. I don't have enough fingers to count the times this sort of thing has happened over the years. It's part of why i'm slowly transitioning to tumbleweed on most of my desktop systems from Arch.