For better hoof quality a feed supplement is best along with a good farrier and regular trims. For really dry areas and dry hooves try over flowing (dumping and cleaning) your water tanks so it's always moist by them and the horses get their hooves wet several times a day when they go to drink. My 120 gallon tank has a slow leak so it's perfect for the 2 horses I have right now, I fill it once or twice a week.
I really don't like any of the topical hoof products, unless you're treating thrush with medicine everything else I believe is a waste of time and money.