RE: Maximum altitude??
The AXI and the Neu motors are not comparable power-wise, the AXI is more powerful and weighs 840 g more. But even if a direct drive and a gear drive are comparable and the weight difference is smaller then this weight put into more battery usually outweighs the 5% gear losses. It's often like in this case: The low-kv motor having the required kv is just one power class higher than the higher-kv gear combination and thus has considerably more weight. AXI offers geared outrunners for a reason: "The possibility of spinning extremely big propeller compared to the size of the unit".