An advantage of Rocky for docker containerisation seems to be a really minimal official (below 10MB) image for that, no maintenance burden.
https://hub.docker.com/r/rockylinux/rockylinux
Debian official image is around 30MB.
If you're experienced on Debian, not much difference. May have to install the epel-release package (for instance, fail2ban is available from there , https://docs.fedoraproject.org/en-US/epel/#_quickstart ) which is probably not very intuitive for someone new to the RedHat side.
dnf provides '*bin/grep'