I am yet to study the above links thoroughly but it seems to me, and using the equation posted early on in this very thread, that the longer the crank arms the more leverage, ergo more torque. But the cadence would not be so high, unless the rider was very strong (assuming a single gear) with very long legs, so the rider’s knees might suffer after a while! The ride would be more anaerobic than aerobic too, and perhaps a more stressful experience!