Earlier quoted context omitted.
Open Build System and OpenQA, for automated building and testing of packages. This is what gets updates to their rolling release Tumbleweed faster than Arch, but with no instability ever. I can't emphasize enough how rock solid Tumbleweed is. OBS also doubles as their own AUR equivalent - you can make your own repo and do your own builds and install from the command line, or browse and install what other people have…
> faster than Arch that's a thing I haven't heard in a long time
Of course, whether or not the most important packages to you hit each distro first could be a totally different story.
Overall, openSUSE Tumbleweed is very up-to-date, though: ~76% by this measure— right up there with Fedora Rawhide and Gentoo.