Wire will contain chickens well enough if it is multiple wire with a close spacing. That netting won't contain chickens well either should they decide to fly over it. I've found chickens given a large area to range won't test the fences anyways unless they are banties or light breeds like Leghorns that like to fly and can easily fly over fences. Wire would work fine for me since it's not a big deal if a chicken wanders out sometimes it still gives them a safe area to get back in to where predators won't get them