With a Smarthome, you can set your doorbell to silent mode, so when there's someone at the door, your kids won’t be awoken by the sound of the doorbell. Instead, the lights in the living room will flash to let you know who's visiting.
With an Intercom, you can always see who is at the door. You’ll have clear live images of your visitor and you can easily speak to them from wherever you are with excellent sound quality.