The top factor is manageability which happens to be a core strength of VMware View 4.6 and one of the main reasons why we win customers.
In this other blog post our technical marketing team put together some videos that compared some key provisioning and management workflows between View 4.6 and XenDesktop 5.0.
If you are a VMware customer and are evaluating a virtual desktop solution, you should really take a close look to these videos as they showcase how View 4.6 delivers a much lower TCO by greatly reducing the time it takes to perform crucial routine tasks required to deploy and manage a VDI solution.
Creating a master image for deployment
Deploying a virtual desktop pool
Add/remove a virtual desktop from a pool
Deleting a desktop pool