I have a cheap pair of Shires rubber ones for turning out, and a pair of umm...think they are woof wear ones for schooling, hacking & lunging etc.
Both are fine, I only use different ones for turnout because he went through a phase of shredding them (better them than his feet!) but they are cheap to replace.
Without doubt Pariani. My arab is turned out 24/7 in them and the do not rub. They are quite thick rubber so offer really good protection and yet they are easy to pull on and off, and so far my boy has never pulled them off himself.
Westropp without a doubt, you can add additional petals for larger hooves or remove some for smaller. They dont slide upwards when they come into contact with the floor at the back of the heel so they dont ever rub.
i like the woof wear ones with the nobbly thing in them to stop them spinning round for comps but i use cheapo shires rubber ones in te field as my two have competitions to see how many they can get through so need to be cheap to replace..