Here's what I personally liked moving from Arch to OpenSUSE:
- OOTB snapshots with BtrFS
- Easier maintenance (this is just true of every distro with a fixed release cycle)
- Zypper is just plain better than Pacman
- 1-click installs with OBS
People also seem to love YaST but I personally loathe it.
Now for the shit I found annoying.
The way OpenSUSE handles proprietary codecs. They're on a separate repo that sometimes gets out of sync with the regular repo so you'll try to update and it'll pester you about changing the source from which ffmpeg is installed because the official repos have a newer version. This is much milder on Leap than on Tumbleweed.
The patterns. Oh my God, the patterns. Unlike Arch, OpenSUSE aims to provide an apple-esque "just works" experience out of the box. This means that when you tell zypper to install "Plasma", you don't just get a bunch of packages from a list called "Plasma" — you get Plasma, a desktop environment. Sure, you can uninstall KMines, but it will come back next update. After all, you didn't install a compositor, a window manager, a panel and a minesweeper clone; you installed Plasma. And KMines is part of Plasma. In theory, you can uninstall the metapackage for the pattern and that'll stop its dependencies from coming back; in practice, every single package on a new install is installed through a pattern so removing them one by one will get really annoying really fast.
Finally, it's set to install recommended packages by default so you'll uninstall the metapackage for the pattern and think you finally got rid of KMines just to update your system, open your menu and find it there because some other package recommends it. You might think there's a config to disable this, and you'd be right, but then you'll update and find yourself with no WiFi because someone decided to split NetworkManager and NetworkManager-wifi into different packages and set the latter as recommended for the former.
In any case, I can think of few things worse than maintaining Arch (or pretty much any rolling release) on computers you don't use daily so give it a shot.
Disclaimer: I haven't used OpenSUSE in about 2 years so some (all?) of my information might be outdated. Apparently YaST is no more. Good. Fucking. Riddance.