The one particular stepper I'm using is Pacsci rated at 845 oz in at the rated current of 3.3 amps which is what I set my drive at. It is a 4 wire series wound and has a phase inductance of 8.3 mh.
Experts seem to all agree that low inductance is required for the best performance and I have found that this is not the case.
Unipolar drives are also said to be inferior, I have been using such a drive on a small lathe set up for a production contract and had no problems at all.
Also, I have never been able to get the type of rpms from a stepper that are discussed on forums either using high or low inductance motors, unipolar or bipolar, series, parallel. I'm talking rpms that that are actually useful to drive anything.
I have purchased high end drives and quality new steppers over the years and never been able to get they speeds I read about, then again i'm a microstepping fan.
Regards