The best replacement for stepper motors is servo motors.

The best alternatives to stepper motors are rated as following:
★★★★★  servo motors
★★  servo
★★  dc motors
★  dc brushless motors
★  servos

Your alternative for stepper motors is not listed? Suggest!
Speaking about stepper motors, one probably shouldn't forget about encoders.

Other search terms related to stepper motors and their ratings are:
★★★★★ encoders
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You have in mind a companion for stepper motors and it is not yet here? Propose!



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