Are both battings in their packaging? If so, check and see what the recommended distance is between quilting lines. You need a batting that will hold up for the distance you plan to quilt. If there is going to be relatively little quilting, I don't think either of these battings would hold up well to multiple washing. In that case, I would consider using Warm n Natural.
Just off-the-cuff, I think most 80/20 and poly battings require quilting every 4 inches (maybe 6). WnN can handle quilting lines up to 10 inches or so apart.