I have a few raised coops and I love them. These are the reasons that I love my raised coops.
PROS
1. Elevated so predators cannot get it.
2. On the hot Louisiana days, they can either hang out on the inside out of the direct sunlight or lay below the covered coop in the shade.
3. Easy access for cleaning. I lay hay (bedding) on the wire floor. When it's time to clean, I remove the hay and the wire floor is pretty much clean. The hay catches the poop. If there are any pieces of poop, I can push them through the wire.
4. My (open air) raised coops gives my chickens the opportunity to have cool nights during those hot Louisiana summer months.
5. When it rains, they don't have to go into a closed building/chicken house/coop to get out of the rain. They can jump in their raised coop and watch the rain drops and take a nap. They can even chill out under the coop and get out of the rain and still get fresh air (outside)
6. If they see a hawk, they can run under the raised coop for protection.
CONS
1. Once you get 1 raised coop, you will want more.