For building a native windows app which can launch multiple web applications in a webview , i have tried a poc using WinUI3 .Main usecase for this is usb peripheral integrations from the webapps loaded in webview and Single Sign On . Reading more on microsoft documentation , i see some features not supported and some slowness compared to UWP. Do i need to go with UWP for a new app or is the recommendation to go with WInUI3 for a new app development .
Supported Feature List Doc - https://learn.microsoft.com/en-us/windows/apps/windows-app-sdk/migrate-to-windows-app-sdk/what-is-supported
Can see WebAuthenticationBroker also in not supported list . Any guidance on what sdk to use . UWP or WinUI3
WinUI3 is the new technology for Windows Desktop. Although it is not perfect now, but it will be improved. Currently, not all the WinRT APIs are able to be used in WinUI3 apps, but you could use win32 APIs to achieve what you want. So I'd suggest you use WinUI if you are familiar with win32 API can you use win32 API to bypass the limitations.
Compared to WinUI3, UWP is more stable. UWP could use all the WinRT APIs. But some features on UWP are not up to date. For example, some features from WebView2 controls are missing on UWP but available on WinUI like print. Another thing is that UWP apps have limitations like system isolation for accessing local files and local network resources.