Windows Server 2012 Hyper-V. VHD or Pass-through Disk?

Hello!

We have planned to install Postgree application on the Windows Server 2003 / 2008 OS. We are in process of virtualization host server configurationplanning and therefore we have the following questions according your experience.

• Is there an essential performance lack if we use VHD/VHDX disks?
• Is there bigger data lost / damaging risk if we use VHD/VHDX files?
• What is your experience with Windows Server 2012 Hyper-V?

Thanks!