HR Org Structure in MDG

Hi MDG Experts,

Does anyone have an opinion on the optimum way to set up the
HR Org structure within the MDG ECC hub?

• Use the existing HR Org Structure from ECC main system,
  and create interfaces to bring in parts of it to the MDG hub?
• Manage the HR Org independently within the MDG
  ECC hub. Create PERNR, Name and e-mail, and assign to positions?

Thanks!

Matt Dawe