Hey, so I've been looking on my new favorite site, Aliexpress :D..

and have been looking at stepper motors,

from what I under stand all nema 23 motors have the same sort of face profile so the longer the motor, more juice it needs and more torque it has.

but how is it, that the nema23 stepper motors from CNC4U are 3.1nm and only 88mm long but on aliexpress a nema23 motor with a length of 115mm is only 2.5nm

my only guess would be that these readings are taken at different voltages? :S

if so should I buy on length or holding torque?

Thanks

115mm nema 23 motor
nema 23 3.1nm