The main advantage should be proper base station handoff. If you have a house that can't be covered by a single wifi access point (or an office), then the normal approach is multiple APs with the same SSID. It's a bit of a hack though, you can't guarantee that your device is connected to the one with the best signal, particularly if you move around, and transitioning involves a connection drop.

Proper cellular radio does measurement of signal to surrounding basestations, and seamless handoff. If would have some advantages over wifi in a corporate environment.