Look at Terry saddles. I use the Butterfly, and for me at least it is the most comfortable saddle I have for very long distances. Better than a B-17, which I also use. The Butterfly is the women’s model (shaped for our delicate butts) but Terry also makes the Fly for men, as well as the Liberator.
Men's Touring Bike Saddles - Endurance Bike Seats | Terry.