If you plan on using CentOS going forward, I would recommend using (starting with) stream, as CentOS 8 will be completely EOL at the end of this year.

That said, you can easily convert a CentOS 8 server to CentOS Stream by running these commands: 

dnf swap centos-linux-repos centos-stream-repos
dnf distro-sync

See https://www.centos.org/centos-stream/


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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Saturday, June 5, 2021 6:24 AM, Arman Khalatyan <arm2arm@gmail.com> wrote:

Hi,
I am looking for some advice on new oVirt: CentOS 8.4 or directly CentOS stream?
If i start with the CentOS 8.4, will be possible later to migrate to stream branch with the production oVirt??

thank you before hand,
Arman