Copy over network or USB

Is there a speed difference copying files over the usb port compared to the network?

I have a drive in my computer that I want to copy to the my book. I can make the drive an external usb drive. Would I see any difference in copy time?

In my experience it’s faster to copy via the USB port.  However, you should test it for yourself since everyone’s network copy speeds seem to vary wildly.  Copy a large file over USB and a similar file over ethernet and see which takes less time.