Unless they are allowed out daily, I would not put eight large hens in an 8 x 4 footprint. Despite all the "square foot" rules, I'd consider that cramped. I'd also not get the one that doesn't have an enclosed area. Storms blow in all the time. Unless....is the coop part at one end of the long roof? If so, having the length of the roof may serve to protect the open side. Perhaps the builder of the second one could make an alteration and enclose the coop part? Also, I can't tell from the pics if they have a wire floor. We've had so many foxes dig under that I'd want at least a 2 x 4 wire floor on it for my own paranoia. If you are in town it's probably not a consideration for you, though. If the first one is inferior materials/construction, then I'd pass and see about the second one. More pictures?
Both are made of hardware cloth and I would add the option of putting in the wire bottom. here is a taller tractor from the inside,