I think the slower the legged and more 'dead headed' the horse the more versatile the horse. If your horse can go in a western pleasure or HUS class and come out winning your horse can do more than a horse that is more spirited or flighty. Quieter horses are easier to work with than horses whose attention it harder to get . My mare is WP all the way I have to use so much leg and seat to just get her to move w/o troping that its ridiculous! Now she was never dogtracked or pulled back to hard she is just lazy, but I can take that horse in a WP class come out jump her or go in barrels and win every class! When I used to go in a barrel class just as a filler for some extra points everyone would woop and tell me not to set my horses head that it was barrels and I was supposed to go fast . Well my all around and high points were so close with another person that barrels would make or break Champ and reserve so I started pushing my horse and I would take like 2nd's and 3rd's in barrels but the minute we were done I would pick up tice on my reins and lope on out ! It drove all the barrel people crazy that I was beating them and loping on out of the ring!lol she does look a little funny when I open her up she not used to running! This right here proves how much more versatile a quiet horse is than a high spirited horse . The fact that a horse would try so hard in every discipline shows how much personality and love they have for their owner.