without a shadow of any dobt the AXI 2208/34 with a hollow shaft if you intend to go with a variable pitch prop at a latter date, do not try the variable pitch prop until you have some experience of the Tensor, if is unlike anything you may have flown before, all axis's are independent of each other i.e. rudder just yaws the nose round and the whole aircraft in a flat circle, ailerons just bank it, not turn it there is no secondary input from these controls. Have fun its a good experience.
Mike