I don't wear long boots - I go for the short boot/gaiter option. but - I don't wear Mountain horse boots as they damage the tendons in the soles of my feet. Ariats are so much more comfortable and wearable.
i tried both boots - one on either leg. the ariats were the best length on my shorts legs and size 4 feet. the ariats were also so comfy. I have ariat short boots too and always wear them to walk long distances cos they are soooo comfy...