There are pros and cons to most multi-copter layouts. A hexacopter, having six propellers, is safer than the four propeller design of a quadcopter, the reason is that if you lose power to a motor in a quadcopter, the other three will not be able to keep the drone balanced, whereas you can lose two props on a hexacopter and still fly evenly. Of course, that depends on which props you lose, we explain more here.