The answer really depends on what the user's requirements are and how well managed the VDI environment is. With pooled VMs, you have the potential to reduce your storage needs, however you will likely want to make to have the ability to deliver and manage user and application state independently from the image. With dedicated VMs, application and user state reside permanently within the user's desktop image, and users will be able to find the exact same desktop environment which they left behind after the last logged out.

The answer really depends on what the user's requirements are and how well managed the VDI environment is. With pooled VMs, you have the potential to reduce your storage needs, however you will likely want to make to have the ability to deliver and manage user and application state independently from the image. With dedicated VMs, application and user state reside permanently within the user's desktop image, and users will be able to find the exact same desktop environment which they left behind after the last logged out.