Macros are client sided, limited to 10 bricks, consistent facing, and unable to have special attributes. They're also built into the game and can be used anywhere. It's like loading without admin, events, items, lights, etc.
Duplicator will only work for that one server, however, it can duplicate an entire build and all it's attributes.
There is a GUI to look at your dupe saves by the way. Go to "Load bricks" > Duplications, then there should be a list in there.