I use wood chips and fir nuggets. Sometimes you can get the wood chips for free, but I get mine at the same place I get the fir nuggets. It is not expensive. The base of the run is river silt and has good drainage. The wood material eventually starts to break down, but has lasted a very long time (almost a year now.) In the beginning we added more as it worked into the soil. Now it is all a really nice mix of material that drains, but is not hard on their feet. It is easy to take care of. I do regular clean-up with a poo scoop and occasionally rake in diatomaceous earth and zeolite. Helps to sweeten things up. The coop has a porch and overhang where I have two dust bath areas which is a mix of the run material, DE, wood ash and whatever pine shavings they kick in from the coop. In another few months I might think about shoveling the top layer out for garden mulch, but it is so nice right now I'm not in a hurry. I use pine shavings in the coop with a dusting of DE and add zeolite on occasion. I keep the bedding pretty deep, but scoop out poop almost daily and turn things over with the help of the girls. Everything stays nice and dry and I haven't had any problems with bugs or pests. It helps A LOT to have a poop board or trays under the roosts. That has cut cleaning time way down and is just all around easier. I find it has reduced how often I need to completely replace the pine shavings.
Good luck with whatever you decide to use!