Is there a difference between private and shared chnnels in terms of apps that I can use?

Another one not supported by Shared Channels, as happens with PC, is Planner. In regards of the stream, situation is already changing with the new Stream over the table...as an example: https://support.microsoft.com/en-us/office/feature-videos-in-a-teams-channel-tab-aad8c949-f286-466c-aaaf-0ca3c5ad5b02