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The vmdk disk format is native to Workstation and is the default disk format.
As such you can expect it to be much better supported as the VHD format.
The VHD format is native to Hyper-V and while VMware Workstation can use it you are not helping yourself by staying on a non default format.
Wil| Author of Vimalin. The virtual machine Backup app for VMware Desktop Products
| Vimalin : Automated backups for VMware Fusion and VMware Workstation Professional
| More info at https://www.vimalin.com
| Twitter @wilva
| VMware Wiki at http://www.vi-toolkit.com