OT: difference between scooter and cordless drill motors?

[John Doe]

Electric powered scooters have motors like this.

http://us.st11.yimg.com/us.st.yimg.com/I/razorama_1911_2198387

What's the difference between that and modern cordless drill
motor?

Size and weight?
Obviously cordless drill motors are smaller/lighter. Is that due to
higher quality and miniaturization? Or do scooter motors have to be
big/heavy?

Power and efficiency?

I'm wondering why a scooter motor has a DC motor controller with a
big aluminum heatsink. What sort of motor controller does a modern
cordless drill include? Why doesn't it require the same?

Apparently cordless drill motors are powerful, at least the way they
are geared. Scooter motors use a belt/chain.

As far as I can tell, given the revolutions per minute, the speed
using either motor would be about the same (the scooter motor as
assembled and the cordless drill motor driving a wheel directly from
the chuck).

What about back pressure on the drill motor? Usually that doesn't
happen like with a scooter motor.

I don't necessarily need all that answered, any comments or insights
are welcome.

Thank you.