when to wire a stepper motor as Unipolar or Bipolar ?

Hello again. Assuming a stepper motor can be wired either way, what are typical reasons for wiring a stepper motor as Unipolar or Bipolar ?
Thanks !
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unipolar: easier to drive because you only need 4 low side switches
bipolar: more powerful because there are more windings powered at a time
chris
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Perfect explanation - Thanks !
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lower power consumption

twice the power consumption of unipolar.
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