Adafruit will not be shipping USPS orders Monday February 18, 2019 for the federal holiday, Presidents Day.
Expedited USPS orders placed after 11am ET Friday February 15 will go out Tuesday February 19.
Less maintenance, dust/water proof, easy to install, higher efficiency gives longer range. The only con with these motors is heat. Heat can accumulate more easily as the water/dust insulation.
Outrunner with belts/chains/gears
Can spin faster with gears/belts, so possibly higher top speed. Con is the added complexity and later maintenance (changing belts, dust, dirt, etc.)
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