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.)
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.