To me the main thing is how dry it stays inside. Wet poop will stink, dry poop will not. It doesn't matter if your floor is bare concrete, dirt, sand, wood chips, wood shavings, hay, straw, dead leaves, Spanish moss, or anything else. If it stays wet, poop is going to stink. Wet organic matter will stink too after a bit. The microbes feeding on it will become the anaerobic ones because if it is too wet the oxygen cannot get to the aerobic microbes you want plus oxygen kill the anaerobic ones. Even the aerobic microbes need a bit of moisture to live and reproduce. If it is really dry even they won't live. The aerobic ones are the ones that give that nice earthy smell. The anaerobic give that sour ammonia smell.
Think of bedding as a diaper. The bedding's job is to absorb the moisture from the poop and dry it out. If the bedding is dry it will absorb the moisture from the poop and keep it from smelling. If a diaper is wet it can't absorb more moisture. Neither can wet bedding.
It is possible for poop to get so thick it won't dry out. That is especially true under the roosts. They digest food at night and continue pooping. Since they are not moving around it can really build up. A lot of us use droppings boards under the roosts to catch that poop and make it easy to remove. There are all kinds of ways to do this. I use a flat surface and scrape the poop off into a bin as needed, then put it on my compost pile. In one area I have plastic bins under the roosts on the coop floor to catch that poop. Some people build trays and fill it with PDZ, sand, wood shavings, whatever so they can scoop the poop like with cat litter. Another method to keep the poop from building up is to rake it into the rest of the bedding if your coop floor is big enough. If you scatter scratch in that area the chickens will scatter if for you when they are digging through that looking for treats.
We all have our favorite bedding materials. As long as it stays dry about anything will work. My thoughts on which bedding is best is what is readily available and fairly inexpensive. How you manage it plays a part too. How often do you clean it out and how do you dispose of it? I use wood shavings from
Tractor Supply as my least expensive most convenient source. Plus when I do clean it out (once very three or four years) I put it on my garden in the fall and till it in. By spring planting it has rotted enough that it's ready. I'm not going to tell you that my method is the greatest thing since peanut butter and sardines on rye with yellow mustard. Your conditions are probably a lot different from mine so different things could work better for you.
Some people like to use what they call the deep litter method. In the DLM you turn your coop floor or run floor into a compost pile. They may toss in kitchen wastes, garden wastes, dead leaves, cut grass, anything you would put in a compost pile. The chickens will keep it turned for you. You get black gold, the compost. If you have 25 acres you could probably find a good use for that. But moisture is critical. If it gets too wet it goes anaerobic and will stink. If it gets too dry the aerobic microbes can't live so the stuff does not get broken down into compost. It needs to be about as moist as a sponge that was soaked and then rung out as dry as you can get it. I'm not sure how that would work on your concrete floor. Mine stays too dry for it to break down but by using droppings boards I can go years without cleaning it out.
I don't know what will work best for you. These are the type of things I think about when deciding what works best for me. Good luck with it.
When I moved onto my two acres i closed the front of a 12' x 60' loafing shed for dry storage for certain equipment. I used an 8' x 12' end for my coop. I don't know your exact plans but that loafing shed was a great resource.
