I have both raised and and a some regular from the ground up buildings. I prefer the smaller raised coop. It makes it easy to clean, There is less dead air space in winter that has to be heated by either the chickens or artificial means. I keep several smaller units 4x8 elevated to provide shade for the chickens. They are way less expensive to build since the height does not need to be more than 4 feet. I have not yet had any rodents in the elevated units but I have had big problems with my larger buildings. I keep several breeds or colors separated so smaller units work well for that. The larger coop is nice and If I did not have the type of breeding program I do, I would probably only have the larger walk in building but in all reality they are less efficient but more convenient.