I don’t really know how stable Fedora Rawhide is, because I only used it once. But OpenSuse does a whole lot of testing before shipping any update. From their website:
Why should you consider openSUSE Tumbleweed over other distributions? The answer lies in its rigorous testing and stability emphasis. OpenSUSE is the base for SUSE Linux Enterprise Server, meaning it’s secure, stable, and provides most of the software and tools you may need. While some rolling release distributions may offer the latest software packages, openSUSE Tumbleweed couples this with a strong emphasis on ensuring these updates won’t destabilize your system. Every Tumbleweed snapshot undergoes rigorous automated testing via openQA, openSUSE’s comprehensive testing tool, before its release. This process prevents critical bugs from reaching your system, providing an unexpected level of stability for a rolling release.