For those that asked what kind of saddle is easier to stay in:
I have found a deep seated ranch saddle built on an 'Association Tree'. These are the deep seated saddles used by saddle bronc riders. I have a saddle like that, with a plain, hard seat, that we have used for years on colts. It is very secure and a LOT harder to fall out of.
But, it is not very comfortable for long rides. I may have a local saddle maker make a saddle for me on an Association Tree, but have it made with a dropped rigging (like the reining saddles that have less bulk under the riders upper leg) and a padded seat that is more narrow like the pleasure saddles made for female riders. The mens' saddles have much wider, flatter seats.
The other thing a rider can do is add 'bucking rolls' to the back of the pommel of the saddle. Many bronc riders and colt starters also use these on every saddle they ride.
I used to love riding Hunt Seat, but I have not put my Passier Saddle on a horse in 6 or 7 years. I just cannot stay in it any more -- even on a really broke horse.