By the experiments and some rough measures related above (coefficient of pull force at 12 m/s wind speed being 3.3, at 10 m/s wind speed being 3), and due to the huge power consumption of Flettner cylindrical balloons (which seems to be several times that of a rigid cylinder) as indicated on Scaling by size and on Scaling by size with a video, the Sharp rotor looks to be the more efficient device among Magnus effect-based balloons if the inflatable version keeps its features.