Like the more solid pipe. Individual pipes are easier to replace when need be - instead of having to replace an entire panel for one slat being badly damaged. Not sure about the gates between each run. And is that gravel I see? Good for barefoot horses if it is:)
I love that there's fans on ceiling and the windows for horses to stick their heads out of. The only thing I don't like is the doors down in the left corner. These would be just some stalls. Maybe for the lesson barn??