Interesting thread! This year we changed from regular straw (not chopped) to the Rose Bud Pine Shavings/Chips. We found that the chicken poop wasn't breaking down with the straw and it was really bad smelling after a while. We haven't had any problems with smell with the pine shavings/chips so far! Would chopped straw make much of a difference compared to non chopped?
Well, What I have found...being a neat freak, is that the shavings made me crazy. They had an awful smell really fast after changing them. They also didn't look very nice all piled up in the mulch pile and they take some time to break down. It was one of those beddings I couldn't wait to get rid of.
If I may, I'll start from the beginning. My hubby has had lots of pets in the past with his ex wife that just totally left a bad taste in his mouth. He has been totally against having any kind of pets...period! I can understand how he feels having taken care of horses, cats, and afghan hounds that he was really fed up with it. I, on the other hand, grew up with dogs and cats, guinne pigs, rabbits, birds, and hampsters. After 10 years with my man, and no pets, I convinced him that I wanted chickens. My brother wanted to give me some pullets. To make a long story short. I knew the reason my hubby was turned off by pets, was because of smells, poop in the yard and other things. I told him that chickens are not pets, but farm yard animals and that they would never be in the house or make poops all over the lawn to clean up. I have made it my mission to keep a spotless and non smelly coop to prove to him that it is ok to have chickens and he has no worries whatsoever. He is now an avid chicken lover who spends more time with those girls than I do!
Anyway, back to your question. I prefer the chopped straw because it isn't as lumpy as the non chopped stuff. I have a small coop and it just works better for my situation. I think it easier for the chickens to walk on and easier to stir up when cleaning. Even when my chickies were babies, it was good for them to walk on because it seems to settle quickly into a flat surface.
The chopped straw is very very dry, so when there are wet poops, they dry up quickly. I hope this helps answer your question,