Does the carpet not get pretty poop-covered? Maybe it doesn't matter. I am concerned about the winter. We get some nasty cold weather.2x4 always. my girls love the stability and we carpet it so there feet stay toasty warm in the winter months. they stand on the 4 inch side. hunker down in the winter on them and sleep very well. no perches, there not small birds there big girls and need comfort ( my opinion.
If you want true results, put them at the same level and in the same locale.Thanks for taking the time, everyone, and even posting pics. My girls and guy have the 2X4's now. I'm now thinking about hunting for some good branches as well. And then we'll see what the
flock decides upon.