4,5,9,12 all address “will I bring it and will it work well”. Larger diameter pipe seems to help with burn and draw. No need for viewing a heat source. I’ve ran Peax, SO box and SO u turn. So far Peax >SO box >SO U-turn. Ultralight is important, but a couple oz don’t matter quite as much late season, late season hunts just have more weight for cold safety. I have to choke on those words a little as I’m a light is right bc hunter, but it’s true! The couple lbs to bring a stove and stay out longer and dry gear has been huge.