I use OpenSUSE (Tumbleweed, the rolling release version) over Arch because Arch has very little useful software outside the AUR whereas OpenSUSE has that in its official repo ("oss"). Anyone can upload anything they want to the AUR and there's no review or even any guarantee that it still builds. It's basically equivalent to how Ubuntu users solve all their problems by adding random users' PPAs. But of course if you are okay with the AUR, then Arch has the benefit that the AUR has a lot more software than OpenSUSE's official repo, and there's a lot less bureaucracy involved with adding new software.

Regardless, I solve all my OpenSUSE problems using the Arch wiki since they're both rolling-release, modern software stacks, systemd, etc distros, so I'm always grateful that Arch exists.