My brother is a Linux first-timer, and he specifically asked me to install Debian after I explained that it’s stability-focused, but as such sacrifices functional updates and is only globally updated once every two years.
Some people need latest and greatest (i.e. here’s your Arch), some need stability over everything (i.e. here’s your Debian), some don’t need extremes and strike a balance somewhere in between (i.e. everything else).
I use Manjaro (Arch-based) on main PC and Debian on a work laptop. Main PC should better enjoy all the benefits of all things new (while standing a week or two behind bleeding-edge to not cut itself, which is Manjaro’s selling point) while work laptop is mission critical and can work perfectly fine with what Debian has to offer, so, Debian it is.