Both VDI and DaaS are two separate technologies for delivering virtual desktops. It is the service delivery mechanism that mainly differentiates these two desktop virtualization technologies.
In VDI, the virtual desktops are created over and served from dedicated, on premise data centers. In VDI, all the underlying hardware used to deliver virtual desktops is procured and managed by the deploying entity itself.
This makes VDI a costlier desktop virtualization technology when compared to DaaS. However, VDI provides the deploying entity more control over data security and privacy. VDI is mostly served through a dedicated, closed network for improved security.
DaaS is also a desktop virtualization technology. In DaaS however, the virtual desktops are created over and served from specialized third party Cloud Service Providers (CSP) like dinCloud. All the infrastructure in case of DaaS is the cloud provider’s responsibility.
DaaS products such as dinHVD allow you all the benefits of VDI, with the additional benefit of not having to maintain the underlying hardware and other aspects of the service. This reduces both costs and administrative overheads for the deploying entities.