There are many types of saddles used in the endurance community. The first one we used was an old stock saddle with the horn cut off! We're currently riding the Specialized Enduro model. It's light, quite comfortable and allows for customized fit to the horse.
But there is not best for all horses and riders saddles out there. It is all a personal decision between you and your horse.
This discussion thread is intended to review as many types/models of saddles as possible with the goal of providing new endurance riders a broad view of what is available, what to look for in terms of fit, and what we should strive for in performance horse saddlery.