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Series connection requires higher voltage and lower current as compared with parallel. Since current is a problem for the driver, but voltage is not, the series connection is usually preferrable.
For example, one small (400 oz-in) stepper I have here is rated 3 amps @ 4.24 volts series, and 6 amps @ 2.12 volts parallel. 3-amp drivers are a lot cheaper than 6-amp drivers.
A series connection provides a high inductance and therefore greater torque at low speeds. A parallel connection will lower the inductance which results in increased torque at faster speeds.
extract from elewhere on the web..
this is right for standard 3d printer like prussa i3 with 2 motors for the Z axe.