Saddle is really not bike dependent. It's more arse dependent. Ride on one you like. I've ridden on a great number of saddles over the years and both those Brooks suit me fine. If you know you like one or the other buy that one.

My fave saddle is the Ideale on my Eisentraut. But the cheap one on my Nano is fine as well. I suppose my tuckus ain't very picky.