Saddles work or they don't. The B17 works for most. I need something
longer, and use a SelleAnatomica Titanico. Actually the Titanico
is basically a long B17 split down the middle.

The B17 is meant for guys who keep their bars close to the height of the saddle.
Same with the Titanico. If your bars are a lot higher or lower, than something else is called for.