which is better for koi,floating pellets or sinking pellets

nowadays there are many fish farm to feed catfish,golden fish,koi, and so on other kinds of fishes, but which kind of pellets is better for koi, floating pellets or sinking pellets?

some people prefer floating fish feed pellet mill to make floating pellets,because they not only can  their fishes, and enjoy hand feeding, but also because they can see what is happening to their food. they worry a bit about with sinking pellets at the bottom of the water

but we can not only just for checking our fishes and enjoy our hand feeding,we should think about our fish features and live habit.