The following matrix shows a selection of features and their state of implementation.

FeatureLinux RD Core SDK by MicrosoftIGEL OS RDP3 ClientNotes
AzureAD authenticationnot applicableyes
Azure Resource Manager v2 Feed supportyesyes
Folder redirectionyesyesFolder redirection is bound to the /media folder, so that locally mounted storage devices, including USB sticks, will be forwarded to the remote session. 
Dynamic folder redirectionnonoUser may select specific drives/folders to redirect at run time.
Smartcard redirectionnonoSmartcard redirection is implemented but not working.  
The problem exists in the RD Core SDK.
Clipboard redirection (text and images)yesyes
Clipboard redirection (files)nono
Microphone redirectionyesyes
Speaker redirectionyesyes
Webcam redirectionnot applicableyesFabulatech webcam redirection is implemented.
Printer redirectionyesyesezeep cloud printing is implemented. It is directly related to the ThinPrint configuration.
CUPS printer redirection is implemented.
USB redirectionnot applicableyesFabulatech USB redirection is implemented.
Scanner redirectionnot applicableyesFabulatech scanner redirection is implemented.
Mouse inputyesyes
Keyboard input (scancodes)yesyes
Keyboard input (Unicode)yesyes
Keyboard input mapping of dead/special keysnot applicableyes
Teams conferencing redirectionyesyesThe “Annotations” feature is currently not available.
Zoom conferencing redirectionnot applicableyesZoom redirection cannot be activated globally, but only for a specific session. 
Multitouch redirectionnonoNo multitouch API present in the Linux RD Core SDK by Microsoft.
AVC Codec support (hardware acceleration)yeswork in progress
Dynamic display changeyesyes
Monitor DPI syncyesyes
Monitor Layout Sync (multimon)yesyes
Restrict full-screen sessions to single displaynot applicableyes
On-premises servicesnot applicablework in progress
RemoteAppsyeslimitedCurrent user interface for RemoteApps control is to be further improved.
Seamless appswork in progressno
Session auto reconnectyesyes
Proxy supportyesyes
Local hostname in a sessionyesyes
Launch a single resource session/applicationnot applicableyesA resource is launched if only one resource is returned.
Dynamic virtual channel supportyeswork in progress
UDP network supportwork in progressno
User-definable hotkeysnot applicableyesSession chooser, session switcher, minimize to taskbar
Realtime user experience indicatorwork in progressno
Configurable AVD Resource Feedyesyes