I did a bunch of distro hopping in the 90's but locked onto Debian (mainly testing, now largely unstable) not long after. I'm still just not sure what compels people elsewhere. Especially now: the Debian installer was vicious if you were a newbie, but I hear it's pretty ok now.
This is largely a me problem! I don't understand what the value add is of other offerings. It's unclear what else would be good or why. Debian feels like it really has what's needed now. Things work. Hardware support is good. Especially in the systemd era, so much of what used to make distros unique is just no longer a factor; there's common means for most Linux 's operation. My gut tells me we are forking and flavoring for not much at all. Aside from learning some new commands, learning Arch has been such a recent non-event for me. It feels like we are having weird popularity contests over nothing. And that amplifies my sense of: why not just use Debian?
But I also have two and a half plus decades of Linux, and my inability to differentiate and assess from beginner's eyes is absolutely key to this all. I try to ask folks, but it's still all so unclear what real motivations, and more, what real differences there are.