You have the choice how to use our add-in, depending on your individual requirements.
The COM add-in supports some features which are not supported with the Office add-in. If you do not need the features being available with the COM add-in, we strongly recommend using the Office add-in, since it’s much more lightweight.
If you need the features of the COM add-in, you basically can decide if:
If you want to use both, we recommend hiding the Office add-in in Windows, so you do not end up with too many buttons.
You can check the differences here.