Why? Because it works and is reliable. I’ve been using Opensuse now for ten years on a server and it updated through all the releases over the years without problems. The machine is getting retired now, though. But the replacement will get Leap again for sure.

openSUSE is one of the old desktop oriented distros. I find it somehow similar to the old glorious Mandrake (r.i.p.). Like it it’s a European distro and both of them are relatively KDE centric and so also somehow similar to Windows. So the philosophy behind both of them is to be user friendly in the way you can do relatively much with the central configuration panel.

It’s just what you’re used to. To me fedora seems weird and I don’t know why people choose it over opensuse. To me opensuse feels like home.

Also yast is great and I don’t get why more distros don’t have a similar thing.

I must admit I’ve mostly been an Ubuntu user since about 2007. But switching to Tumbleweed was like a breath of fresh air. A lot of the things were different, but accumulated experience over years allowed me to feel at home. I used YaST once or twice, you don’t need it at all.

Most modern distros are either new distro trying to have more modern sensibilities, distros based off of Debian, Arch, or Fedora, or occasionally original things that are okay with being superficially similar to one of those while doing things differently at lower levels. OpenSUSE is one of the few remaining distros from the olden days that has been independent and doing their own thing for decades without spawning a bunch of forks or dying off. If you want to try something even older and crazier Slackware is sure an experience.

You could read the docs.