What type of motor is more desirable, if the requirement is to rotate a load with high torque by about 30-60 degrees?
The advantage of steppers is their open-loop simplicity. You just command it to take a step, and without any feedback you know how much it's rotated. Of course you need to do the calculations to be sure the stepper is always operating within its limits: otherwise you miss steps and you either need to add feedback (negating the advantage of simplicity) or accept that you may end up rotating by something other than the desired amount.

If you want torque feedback, then you don't have an open-loop system anymore. The advantage of simplicity is lost, so you might as well use a servomotor.