Central Texas chicken keeper.
I use deep bedding up in the coop portion and maybe deep litter in the open run portion. You can be the judge.
The elevated coop has a plywood floor covered with linoleum squares. In hindsight, I think these are unnecessary but I was concerned about moisture rotting the wood. If I notice smell, I sprinkle PDZ over the poop areas (mainly under the roost) and then toss a new layer of shaving over that, perhaps every 3-4 weeks. It’s fairly deep by now so tossing in treats for the girls to do some stirring now and then is sufficient. I put fresh shavings in their laying boxes weekly simply bc I have two that just love to kick it all out and lay on the mat. Every few months, I scrape the heavily soiled bedding from under the roost bars straight into the run. The run has a dirt floor and about 8-10” of shavings. I never put clean shaving in the run, just soiled shaving from the coop is making this deeper. I toss some treats and the girls go nuts. Honestly, they dig down into it so much, it gets turned and mixed. It has definitely broken down and I’m eager to remove some to my compost/dirt pile in the spring for use in the garden. Even if it’s not truly composting (I’m new to this and just don’t know), it’s good dirt and I always need dirt.
Pros, from my perspective:
1. no daily work at all;
2. Smells nice (guests comment on how surprisingly pleasant it is by the coop);
3. low cost—one bale of shaving lasts about 2 months;
4. much cleaner than my former method of putting in, cleaning out regularly.
5. Had minimal flies over the summer—unusual here.
6. Soft landings
7. Gave them something to do when locked in for 5 days during our ice storm—they dug and dug and dug.
8. when I nestled the water down into the bedding in the run, it did not freeze (leading me to believe this is indeed deep litter that is composting and warm).
9. Seriously, the smell. I went from 5 chickens and a very stinky coop that I worked hard to keep up with to 16 (now 12) in deep bedding with less work and no offensive smells
Cons, from my perspective:
1. They kick the shavings out the door since it’s open all day. It’s a mess and my hubby requires I shovel that back in. I’ll put a taller kick board in front of the door this spring.
2. The run never LOOKS fresh and clean. It smells just fine, but I do miss the look of a clean house.
3. Chicken keeping friends don’t believe me that it’s awesome. After I’ve shown off my flock and told all their names/likes/dislikes...I have to reciprocate and I’m required by politeness to stand by their stinky coops to admire their chickens

4. I’ve learned recently that deep bedding likely hosts some nasties like worm eggs that will lead to reinfestation of my flock.