Cities across China are ramping up their AI ambitions. But as competition intensifies, analysts urge them to play to their strengths - not blindly copy one another. SHENZHEN/SHANGHAI: Drones zip through the air, swiftly picking up and dropping off orders like food and medicine. Robot taxis and driverless cars weave seamlessly in and out of traffic while life-sized “digital humans” guide commuters at busy metro stations. This is everyday reality in Shenzhen, a vibrant tech hub at the forefront