The 2.8v 1.68a 45Ncm stepper would be best of those two.
Despite their advertising pololu modules top out at about 1.7 amps
The 2amp stepper may work, but will not get the 2amp for full torque so will be under the rated torque values
Despite their advertising pololu modules top out at about 1.7 amps
The 2amp stepper may work, but will not get the 2amp for full torque so will be under the rated torque values