Transaction SE09 vs. SE10
With Transaction SE09 or SE10 you can call the initial screen of the Transport Organizer.
Transaction SE09 is used for workbench organizer which is the set of utilities for development change management. In other words all development changes are tracked via Workbench organizer.
The developers can track changes to all ABAP workbench objects like dictionary, reports, module pools, etc.through SE09 T.code. This is a developer-specific transaction and mostly all developers have access to this transaction.
Transaction SE10 is used for Customizing organizer which is the set of tools for customizing change management. All customizing changes are tracked via customizing organizer. Transaction SE10 - Customizing Requests which is Global. It affects to all the clients in the system. Generally Basis team use to develop it. Basically it is used to displays all the customizing requests in the system.