But quadrotors can be dialed in to an arbitrary GPS coordinate accurately and deliver a payload. That's the whole ballgame with assassination or sabotage.
The only place a quadrotor would shine above a model aircraft in this case would be moving into a building. Any open air location would be equally vulnerable to either solution, with the model aircraft capable of bringing more to the party, as it were.
...or operating around obstacles (trees, overhangs, vehicles). Anyplace that has to be approached in anything except a fast horizontal vector, which in town is any place at all pretty much?
Add to that identifying a target visually and tracking. A plane could hit a fixed target but if its moving, a model plane could have an awful time matching speed and direction.
