Should I timesync against PDC Emulator or NTP timesource? (PDC not in hub)

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http://serverfault.com – I know the best practice would be to have the PDC Emulator to sync against an external NTP time source, and have all other domain controllers sync against the PDC Emulator. However, my network layout is... 'interesting', to say the least. My company is a multinational company. For reasons unknown to mere mortals, the group headquarter (located in another country) demands all country-branch-offices to connect directly to the group headquarter instead of the country-head-office. The PDC Emulator is located in the country-head-office. But the domain is country-wide, not global. In other words (HowTos)