Neoprene(chloroprene) is more elastic and has higher tensile strength than EPDM. The down side for Neoprene is that it has duble bonds in the backbone of its polymer and double bonds can be broken by atmospheric ozone, which means it can breake if it's exposed to weather and wind to much. This is true to the polymer in general, how much effect it will have in this case I don't know. Another benefit of Neoprene is it's good resistane to oils and fuel. But I suppose you don't take oil-baths with rubber-chainmail anyways?