With embedded vCenetr PSC is always external. You end up with two VMs by design. Joining external vCenter gives you an option to choose between imbedded or external PSC. We want to be able to handle both options since we don't have control how vCenter is deployed. In the preinstallation checklist based on your choices, the Excel spreadsheet opens or hide the fields needed for your particular case.
When we deploy a new VxRail with embedded vCenter VCSA we also get an external psc. Is the external psc always installed when choosen an embedded vCenter VCSA?   When we fill in during the VxRail setup that the psc should have the same name and ip as the vCenter VCSA there is a name/ip conflict warning. I prefer a embedded psc on the vCenter VCSA. The only vSphere SSO design consideration to use an external psc is when you plan to connect more than one vCenter VCSA to the same SSO domain.And in my opinion you will never use more then one vCenter VCSA in a VxRail with embedded vCenter VCSA.  When you decide to use an external vCenter VCSA with embedded psc you can fill in the same name and ip for the vCenter VCSA and psc and it works fine.  Someone any information about this?
VxRail 4.0 with embedded vCenter VCSA