Hi Bakursait,
"optimal" is in the eye of the beyonder really. Depending on your installation method, ubuntu 22.04, Rocky Linux 9, Debian 11 & 12, plus CentOS stream 9 are all good bases. More commercial, RHEL/Oracle are equals with the more free as a beer distros.
My personal go to is rocky Linux 9 and kolla-ansible for deployment. Though I use ubuntu on my mac mini based lab (ubuntu does mac hardware a bit better than Rocky).
The above link assumes an all in one node, so that may present some limitations to what you are looking to do, but it's a good place to start. We have 50+ node Openstack clouds on Rocky with kolla-ansible, it's a great combo, but no means the only combo. We have a broad echo-system in this community.
Good luck!
Cheers.
Michael