Question for those of you who chose the B17S over the Team Pro S: why?

I have a friend who got a Team Pro S several years ago when I guess it looked as if Brooks was going out of business. But she never put it on her bike and now has offered it to me, at a severely reduced price, of course. So I said I'd give it a spin. Put it on my touring/everything else bike (get my Bianchi tomorrow!!!!!!), and then it started raining, so haven't had a chance to really try it out yet. But it seems that I can't jam it back far enough. So I checked out dimensions on the Wallingford site, looking for maybe a longer women's saddle, but they all look the same, lengthwise.

So, again, does the B17S offer any advantages over the Team Pro S, like, for example, maybe, length? Thanks!