My ideas come from my days as a reckless youth racing slot cars, and rewinding slot cars motors on commercial tracks (wow 1966 that was a while ago). The large can motors always drew less amps than higher rpm small can motors. I always had the fastest 1/24" car on the track on a long straightaways, but I always got yelled at by Kyle, the guy that ran the place, for sucking the amps out of the track.
The point being side by side, with the same current, a large motor will do more work and run cooler than a smaller motor.
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