@jaredbusch XCP-ng and XenOrchestra are both supported very well. Just today, someone using the latest version of VirtualBox had problems with importing a VirtualBox.OVA into XCP-ng using XenOrchestra. A dev looked at the problem and posted patches to github very same day. Unlike other vendors, you are dealing directly with developers as opposed to a call center "I do not want to be here. I just want to close this ticket" hourly employee.

@scottalanmiller As someone who has had to deal with vendor supplied hardware and software for a medical practice, I have come to firmly believe vendors are the enemy, a $very $very $expensive enemy.

@stacksofplates

XCP-ng and XE cli and XenOrchestra and XCPngCenter use the well known XEN API known as "XAPI".

Start a task using the XE command line and it shows up in the other task lists such as that in XenOrchestra.

Start a vm move from XCPNGcenter and it shows up under xe task-list.

Start a vm copy command from XenOrchestra and it will show up under xe task-list.

We use one set of tools to manage both old Citrix 6.5 hosts and the latest XCP-ng hosts.

Not sure how that compares to ProxMox/KVM. Do not know on the status of a real KVM API, but as a long time bash user, I would consider bash an API.

@francesco-provino Amazon Web Services may have a slight disagreement with you on whether KVM or XEN is suitable for business.