There are a bunch of software-related reasons why openSUSE is a good choice (snapper, zypper, yast, to name a few), although few are exclusive to openSUSE. I think the primary selling point of openSUSE (Tumbleweed) is that it is a rolling release distro that never crashes, never requires attention, and just works. One of the reasons people don't talk about it is probably that it is boring. All packages are tested extensively. It never breaks. And even if it did break, the default btrfs file system and snapper ensure that the system doesn't stay broken for longer than it takes to reboot.

If you want a distro that is up to date, easy to use, and dependable, openSUSE is a fantastic choice. It's just not very exciting to have something that never requires attention; a lot of people use Linux because they like things requiring attention.

As an afterthought, I also think the fact that openSUSE and its users seem to be pathologically unable to create any logo or symbol for anything even tangentially related to the distribution that doesn't look like absolute shit might be holding them back.