Earlier quoted context omitted.
If the 6-month release cycle is too frequent for you as a desktop user, consider using RHEL/Centos. In general Red Hat's distros are top-notch and easier to reason about than other distros.
What? The software in CentOS' official repositories is horribly outdated (aka 'stable', which is why it runs on many servers). Why should a desktop system run CentOS? I'd rather recommend Ubuntu or one of its descendants. They also have LTS versions, if stability is a concern, but are not as outdated as CentOS.
Fedora isn't cutting edge compared to actual rolling release distros so if that's still too much for you then RHEL or CentOS should be enough.