Probably neither. I doubt the presence of a driver today is much of a deterrent to thieves. Most theft from trucks is by people working in the warehouse.
There's not much opportunity to steal stuff from a truck except when it's being loaded/unloaded. That doesn't change whether or not it's driverless. If you're planning on hijacking it enroute, then whether or not there's a driver makes little difference. cf, carjackers.
There's not much opportunity to steal stuff from a truck except when it's being loaded/unloaded. That doesn't change whether or not it's driverless. If you're planning on hijacking it enroute, then whether or not there's a driver makes little difference. cf, carjackers.