Actually, I do both. My coop is 8x8 with an additional 12x12 attached run. I have 9 chickens living in it.I do deep litter (pine shavings) on the floor, but sweet PDZ on the poop board. Typically chickens do most of their pooping when roosting. So by using a poop board with sweet PDZ to catch the poop, it keeps the shavings clean (for the most part.) And the poop board does its job because the sweet PDZ absorbs the odors and makes clean up a breeze. My coop does not smell. And it's because of the sweet PDZ. The litter method alone does not control the smell. I also sprinkle the sweet PDZ over the pine shavings, which helps to absorb any odors from poop that gets mixed in with it. Good luck!
Here's the outside...I wrote a story about our coop building experience last year. We had a great time with it. It's a children's playhouse kit, in the design of an old school house, that we converted to a coop, to which we added an enclosed run. Hence, we call it the Schoop. 
