I had done a few easier Linux installs on Raspberry Pis and VMs in the past, but when I decided I wanted to try using Linux as my daily driver on my desktop (dual-booted with Windows at the time) I decided to go with a manual Arch install using a guide and I would 100% recommend it if you’re trying to pick up Linux knowledge. It’s really not a difficult process to just follow step-by-step, but I looked up each command as they came up in the guide so I could try to understand what I was doing and why.
I don’t know what packages archinstall includes because I’ve never used it, but really the biggest thing for me learning was booting into a barebones Arch install. Looking into the different options for components and getting everything I needed setup and configured how I wanted was invaluable.
That being said, now that I know how, is that how I would choose to install it? Nah, I use the CachyOS installer now, but if I wanted stock Arch I’d probably use archinstall.