If you disregard the load, what is the point of the comparison??
I believe the OP's point is that the 2-stage is going to require no more power than the single-stage. I have yet to use my 2-stage, but I'd say that's probably true. I can easily stall the engine on my 782 with my QA-36A in deep or wet snow. 'Less power required' is relative. The starting torque seems to be higher on the single-stage throwers than on the 2-stage blowers. This makes sense because the auger on a single stage has much more inertia than the the blower on the 2-stage.
I would say that the difference in power required for each is a wash without performing some sort of experiment to determine if there really is a difference. There are several ways that you could define efficiency for this, which could possibly result in different conclusions being reached as to which one is more efficient. To me, it would be the one that moves the largest mass of snow the fastest on the least amount of fuel.
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