The key thing for me is that when I land, I feel like I'm in a real world. In X-Plane, if I land off-airport, I feel like I'm in a simulator. And no matter how much free scenery you download, most X-Plane airports are nothing more than runways, taxiways, ramps and lights. So it takes a lot of work in X-Plane to get that "I've arrived" feeling. Otherwise, when I land, I feel like I'm in a simulator. My Anteworld experience is limited, but I can already tell that when I shut down the engines, I will feel like I should be able to get out of my cockpit and smell fresh green grass in the air, and will need to swat at the flies in the woods. So I can't wait for biomes and lakes and rivers. Weather too. When the world is more or less complete, X-Plane will become a procedures sim and I will live in Outerra.