Arch Linux is the only Linux. It's so easy to learn and use. Arch Linux is the only operating system. It takes 20 minutes to learn arch if you know Linux and Unix.
I used to run Slackware, and the user experience is pretty terrible compared to Arch or OpenBSD. The absence of a package manager that tracks dependencies is not a “truer” Unix experience. All the BSDs provide a more Unixy experience than Linux and they all track dependencies.
If Slackware was updated more often, the system would work better. The dynamic libs are always way out of date, and god help you if you want to install a newer version.
Until you figure that Ubuntu is full of shit. Snap packages are a piece of shit, and, whenever you need any kind of unmastobatory software packages you'll need to add PPAs. Ubuntu has gone to hell since the Snap ordeal. Arch is the only way to go.
I use arch exactly for that reason, but I could not imagine getting started with arch as my first linux experience. You should at least learn the basics on ubuntu first. I think there's a good natural progression with linux, and that you can and should switch to arch once you outgrow ubuntu.