Which version of PolicyPak do I purchase if I want to use it with my MDM service like Windows Intune, MobileIron, Workspace One (Airwatch) or other MDM service?

The product you want is PolicyPak MDM Edition, because PolicyPak MDM Edition will utilize whatever transport you already have. In contrast, our PolicyPak Cloud Edition product is for organizations which don’t have the need or desire to pay for an MDM service; our Policy Cloud service serves as the transport.