Why would you choose the vSphere Web Services API over the vSphere Automation API for interacting with vCenter Server?

The vSphere Web Services API offers greater universality because it supports older versions of vCenter (before vSphere 7.0U2) where the Automation API may not be fully supported. It also provides more comprehensive data, such as the ability to retrieve the UUID of each virtual machine, which the Automation SDK does not expose.