I guess I can chime in here since I live in Chicago and I use a B17. I find the unsprung saddle works fine on the streets here. The way the saddle is constructed with a yoke front and back, the leather suspended between them dampens the road bumps pretty well. Of course I've never tried the Champion Flyer so I cant compare the two. I'm also thinking that since you ride a touring bike the narrower b17 type would work the best. If you have your bike set up so your in a more upright position then the wider saddle would suit you better.

Hope someone comes along who had used both saddles and can give you a comparison. I'm under the impression that the sprung saddles are for unpaved roads and third world streets.