Originally Posted by SorrelHorse
This is a very broad question.
It depends entirely on the horse. I have seen QHs who couldn't turn a 50 foot round pen let alone a barrel.
My personal preference is actually a cross breed. ArabxQH. Fast and catty with lost of endurance and enough build to them to handle the pounding.
But if your passion is QHs, then get a QH. Find one with nice barrel bloodlines. However, in the bloodlines sense, I like getting a horse with run on one side of its pedigree and something like cows or reining on the other side. But this is just my opinion
As for size, it doesn't matter. I have ridden a 16hh horse consistently in the money just as much as I have my little 14hh mare.
Idk if I want to get my "own" horse now though cause I already am almost training my friends horse for barrels, she is basically the discription you said xD She is a cattle/speed horse. She is just great! If I got my own horse I would probably not work with her for awhile and I would hate not working with her, I have been thinking about this and I finally decided I probably wont get my own horse, personal choice, for a year or two atleast so I can work with her. I rode her yesterday and she was FANTASTIC, theres too many stories I could tell you about her LOL