I am either here or Vegas for layovers and I would say these airports are very similar. Phoenix is bigger I think but has many options to eat and shop. Some high end stores as well. And my favorite Brighton jewelry. They have a Peets too which is really nice and comfy.
Different concourses have a vibe but each one is fine. I seem to end up in different ones. Lots of moving walkways as things are a bit more spread out.
Not a bad place to hang out if you have too.