CentOS 7.9 currently
Starburst recommends AlmaLinux 8.8.
Josemnunez said the devs are hard at work on EL9 support.
So I am targeting AlmaLinux 9 for next spring deployment. Looking to ELevate my CentOS 7.9 servers to AlmaLinux 9 at that time.
But AWSmonster has the best CWP setup documentation I've seen -- better than the wiki.