If your run isn't covered, I personally wouldn't put pellets out there unless you want the sawdust it becomes. That's nice as it's dust-free. It's just that I think it would be wet most of the time and take a long time to dry out.I did put down a thin layer of pellets under the pine shavings in the coop and a bunch in the run. I’ll get more pellets and really layer them up. Thanks for the tip!
We bought sod for our breeding pens, and when that gets mucky, we put a thin layer of straw on top.
Here's a post about ideas for what to use in a run.
https://www.backyardchickens.com/threads/constructing-run-floor.1666995/
