Join Date: Oct 2005
Location: Ormond Beach, FL
Bikes: 2005 Specialized Roubaix Elite
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I have one of each. The B67 is a bit wider at the back and would be a better choice for a larger person. The forward part of the saddle is very close in dimension to the Flyer, and since it's that part of the Flyer that's giving you problems, the B67 likely would not be an improvement. Note that both models are intended for a rather upright riding position - an "aero" position would aggravate your problem.
The new Brooks Imperial would seem to be an answer to your problem. It's slotted down the middle to yield a bit more to the soft tissues in the prostate area. Have a look in the Classic and Vintage section of BikeForums for a seemingly endless discussion of the Imperial.