I heard of concerns regarding chickens eating the bedding pellets. So let me comfort your mind some. Chickens do choose what they want to eat by taste.
How do I know

When I was at the farm store,, I purchased my Regular ALFlock pellets, and also got some Rabbit Pellets, as well as All Stock pellets.
The rabbit pellets, are intended for Rabbits. The AllStock, is intended for any animal you may have on your farm.
So I offered dishes of the Rabbit pellets, and the AllStock pellets to my chickens.
Chickens totally refused the Rabbit food. They nibbled slightly on the AllStock pellets,, but only when they ran out of Chicken pellets.
So conclusion is.... If it does not taste good to chicken,, they don't eat it.
I also have some of the horse pellet bedding. I use it in my Kitty Litter boxes. This way, I dump the contents into compost area.
I use Hay for my coop bedding. Often during summer, I will dry my grass clippings, and use those.
So if you go with the Horse pellets,, Place a layer of an Inch on floor. Use a kitty litter scoop, to scoop out the gumdrops. Your pellets will last surprisingly long.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,