The Light version is a great choice for individual work. But it works only with one computer (although it can be installed on two). Sharing MultiMaps functions are not available. Also, not available some Data Collection criteria needed above all in professional work: work with topic properties, formulas, some task info, etc.
Full version is designed for professional work with MindManager and a (very) large number of maps. Its strong point is that it can share all data between different computers. Full version is about 2 times more power than Light.
Detailed comparison of both versions see here.
MultiMaps v4 o Light
a MultiMaps v5 Full
MultiMaps allows you to automatically synchronize data between maps (even on different computers). If you only need this function (or if you need to interchange map data with your employees), you can purchase (for yourself or for your employees) the Synchronization module only. In the Free version you’ll get the full Synchronization functionality, and in the Light version you can also exchange MultiMaps data between different computers. For details, see “Shared access” section in the MultiMaps Help.