Reining horses take alot of training to make the pattern correct. They have to change leads both ways, doing a flying change, they have to do good rollbacks, great stops, fast and slow circles and all have to be under perfect control, have a perfect headset, etc.
A good reining horse is absolutely beautiful to watch do a reining pattern.
But to be truthful, its not just how fast a horse can turn a barrel and run fast, a good pattern has to be run to be fast, exact turns around the barrels, the horse changing leads at the right time, the rider turning to look at the next barrel, knowing when to stop the forward motion so the horse can make the circle fast and correct without dropping its shoulder.
Both reining and barrels, along with all types of riding take a well trained horse and rider to do it correctly