In my day of training barrel horses, I didn't care for riding in leather reins. The always felt bulking and stiff to be, when I'm running I want to grab a handful of rein and run, not mess with sliding my hands around on still leather that wouldn't fold. But I guess everyone to their own lol. Now all I ride with is rawhide or horsehair. I actually hate leather reins no matter what western discipline.
~Started young horses in Bosca te Ador, unto the two rein the old Spanish spade, brought them along with two hands that were gentle. Some fine reining horses as ever were made~