1- Expertise and Experience

Despite the fact that DaaS is still a relatively new field, a number of companies have already started to offer DaaS services. Even while being in company does not reflect the quality of services a provider gives, it nevertheless demonstrates that clients have confidence in them.

The knowledge of the provider in providing DaaS services is another factor. Find out if the service provider has specialists in cloud computing and desktop virtualization. You wouldn't want to purchase virtual desktops from a vendor without industry knowledge.

2- Which Desktop Models Are Covered by Your Services?
Virtual desktops can be classified as either permanent or non-persistent, both with its own advantages and disadvantages.
Once restarted, the non-persistent desktops return to their initial state. Therefore, if a user logs into a virtual desktop, that desktop is only theirs until they log out. The next time the same person comes in, they are given a different desktop at random.
A persistent desktop, on the other hand, keeps all user settings even after a restart. To reconnect to the same virtual desktop, the user can log out and back in again. However, compared to non-persistent desktops, persistent desktops use greater storage space.
Knowing the appropriate type of desktops you need for your office and select the provider that offers you the same. 

3- App virtualisation

Desktop virtualization and application virtualization both allow for the simultaneous installation of virtual copies of an application on numerous virtual desktops.
The ability of the apps to run on any platform without being constrained by the Operating System is another benefit of app virtualization.
Inquire about application virtualization with the DaaS solution supplier.