Hello anonymous userEpstein-6379,
Thank you for reaching out to the Microsoft Q&A platform. Happy to answer your question.
I would say earlier version Windows Virtual Desktop (WVD) and latest version Azure Virtual Desktop(AVD) as the successor to on-prem deployments of Remote Desktop Services (RDS), and Virtual Desktop Infrastructure (VDI).
Microsoft offers 2 Desktop as a service(DaaS) Product, windows 365 and AVD.
Under-the-hood, both AVD and Windows 365 leverage a similar set of Microsoft cloud technologies. Technically, Windows 365 is built on top of existing AVD components but has a different transactional model (fixed price vs. consumption-based).
For a detailed comparison, you could refer to windows-365-vs-azure-virtual-desktop-avd-comparing-two-daas-
There is no catalog for these 2 available VDI solutions, but you can refer to the documentation links for these 2 as the doc has end to end concepts/How-to guides as well as the references.
Adding the links here
https://learn.microsoft.com/en-us/azure/virtual-desktop/
https://learn.microsoft.com/en-us/windows-365/
For VM sizing, you can refer to the following link
Virtual machine sizing guidelines lists the maximum suggested number of users per virtual central processing unit (vCPU) and minimum VM configurations for different workloads. This data helps estimate the VMs you need in your host pool.
For the OS:
Azure Virtual Desktop session hosts: A host pool can run the following operating systems:
Windows 7 Enterprise
Windows 10 Enterprise
Windows 10 Enterprise Multi-session
Windows Server 2012 R2 and above
Custom Windows system images with pre-loaded apps, group policies, or other customizations
For more detals on considerations/limitations/components, you can refer to windows-virtual-desktop
Please "Accept as Answer" and Upvote if any of the above helped to help others in the community looking for remediation for similar issues.