Hello @Paul McGeady
Thank you for reaching out to the Microsoft Q&A platform.
The Large Gallery view is not supported in Teams on Azure Virtual Desktop. You can find the supported features for Teams on Azure Virtual Desktop in the following link:
https://learn.microsoft.com/en-us/azure/virtual-desktop/teams-supported-features
As for the corporate backgrounds, it is supported in Teams on Azure Virtual Desktop. You can find more information about the new features and product updates for Azure Virtual Desktop in
https://learn.microsoft.com/en-us/azure/virtual-desktop/whats-new
As far as i know there isn't a comparison document between standard MS Teams installations versus AVD Media Optimized.
Let me know if you have any further questions
Please accept as answer and upvote if the above information is helpful for the benefit of the community.