Alma has a few affordances as it's no longer RHEL source compatible, which means it could ship priviledge escalation fixes with new kernel updates faster.
Rocky responded with an extra, optional to enable, security repo to provide mitigations to the exploits while waiting for RHEL to downstream.
Look pretty well maintained to me. If only judging by recent events.
The manuals, indeed are good, though for more esoteric issues I land too often on a gated answer page.
I don't care much about being fully RHEL compatible, or no ABI changes at all. I just want a system that gets security fixes quickly with as little chances of breaking things as possible.
Fedora CoreOS in particular has had a good track record delivering patches quickly. Like for CopyFail was pushed to the stable channel in about a day, IIRC, but the patch was already available within a few hours of disclosure in the "next" / testing channel.
Talos and Flatcar are also worth considering if you want an even smaller attack surface, from what I heard they weren't even affected by CopyFail.