I really don't know what to get. I'm also talking about the Cherry MX Brown version of the Zero.
I'd personally go with the Ducky - better build quality (I heard that the Logitech had some issues and a friend of mine returned his recently, 2 days after purchasing) and the Ducky has a much sleeker look.
Yup, I just ordered it a couple mins ago, i decided the price for the G170+ isn't as sweet as the Zero's. Thanks!