Here comes a quick comparison table between the Topdon Topscan Pro and Topscan Master diagnostic scanners.
In sum:
Topscan Master supports more special functions than Topscan Pro.
Topscan Pro has IMMO Function, Topscan master does not.
Topscan Master supports CAN FD and DoIP protocol, Topscan pro only supports CAN FD protocol.
Topscan Pro software renewal is cheaper then Topscan Master.