salamat po sa link... ano kaya dapat? unipolar, o bipolar na stepper motor?
Unipolar drives are generally simpler to make compared to the bipolar drivers. Unipolars use half as many power transistors as the bipolar drive. But they don't perform as well as bipolar drive. They don't allow the motor to deliver as much power (torque at a given speed).
If you are new to electronics and even newer to step motors, it may be best to start with the unipolar driver. But it may not be sufficient for your project.
As to the issue of precise angle movement, both types can deliver the same. Microstep drivers can deliver very fine angle steps. I have seen unipolar microstep drivers but most microstep drivers are bipolar.
Added: Step motor wiring connections. 6-wire Unipolar motors can be used in bipolar drives.http://www.probotix.com/stepper_motors/unipolar_bipolar/