The type that brad has is easier to stand up or shoot from. That kind also come with a tray on the side for your coffee cup.
I want seats for fishing.
I've seem his seats and they look comfy. they are pretty common here in the PNW. Cabela's has some similar powdercoated spider legs. They are great for fishing but IMHO take up too much room when you are trying to set decoys, etc. Even a Crusader (19 foot boat) is too small for a large rig of decoys, 3 guys and big unfoldable seats. ;-)