The Ethernet smooth stepper has proved to be better supported as they have more of them in the market and they are less immune to electrical noise and interference.
It depends what you want to do with it, but the USB driver has not been updated in near 2 years, but the plan is to update it after they have released their next mach4 driver update (last one dated July 2015)
I'd pay the little extra and get the Ethernet board if I were you (I have both, but keep meaning to sell the USB one as its not used), and if you wanted an smooth stepper...
Suggest you think about an easy to wire / quick to wire breakout board too
Register and have a look at their forum so you are aware of the issues that people have had
Rob
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