Just to clarify:
All ships have the same "system" and interface by now. The difference is primarily in screen size, resolution and functionality. The 764ER and the unmodded 777s have the original touchscreens, which are pretty small. They also may have a smaller server and thus a reduced selection of items to watch. The newest screens (the A330 fleet, most narrowbodies) allow you to pinch and zoom the maps like on an ipad.
The other x-factor is ships with live TV, which are on 757s, 737s, 319, 320, 321.