XXX Tower NNZ with you
I think there's a hidden message here as well. A call "XXX Tower NNZ with you", "XXX Center NNZ FL300 inbound MASTI", "XXX Tower NNZ established localizer 24" or something along those lines, also conveys the message that a normal, expected handover from another frequency is in progress. The controller may even have the flight strip in front of him already. He knows that the pilot will simply continue doing whatever the previous controller cleared him to do and there's no rush to acknowledge his presence, issue instructions, clearances or whatever.
In contrast, "XXX Tower NNZ" typically seems to mean "I want to talk to you because I've got a complicated request that I don't want to transmit in my initial call". So it may prompt the tower to get back to you earlier than in the previous case. After which you've got to tell the controller that you've got nothing to tell or ask them.