Multicopters are mechanically simpler than helicopters and thus can be cheaper. Assuming that power system is electric, they are easier to control. Because of t

Multicopters are mechanically simpler than helicopters and thus can be cheaper. Assuming that power system is electric, they are easier to control. Because of the rotor redundancy they can continue flight even after losing several engines/blades, while losing engine on helicopter requires to perform autorotation landing, which is far from trivial. Also smaller blade size results in lower noise levels, which is important in urban settings. If we are talking about efficiency at longer distances with VTOL capability, then convertiplanes are more efficient than helicopters.