I don't have a run for my ducks. I use to, but converted it into a coop expansion instead. I have a large fenced area with a 3-4 ft fencing. My ducks can definitely jump the fence, and even potentially squeeze through some of our fencing. However, I have never had them leave the fenced area with one exception. My Muscovy use to like to hop the fence to lay eggs and then would jump back. I added that area into their fenced area and they no longer jump the fence.
I clipped only my Muscovy, because they can fly. I did it for safety reasons, so I can get them in at night.
Mine are happier with lots of area to roam. But it does come with the risk of predators. I have lots of trees and brush piles for my ducks to hide under. Also I have my dogs in with my ducks as deterrents. You have to decide the risk you are willing to take, what you can do to reduce those risks.