For more stability I would go with RedHat 7.3 and the latest of cpanel. The issue about RedHat 7.3 & 8.0 is well discussed on many forums. Some friends that know enough about Linux & RedHat always adviced me to avoid the RedHat versions x.0 (ending with 0). Don't ask me details why not choose the RedHat 8.0 because I couldn't really respond, I'm just reporting what I have heard or read.