[edgyswingset]

It's the better choice for a number of reasons when the scale of the application(s) increases a lot. It's a premium product that comes loaded with features you need when you're building something at a scale larger than independently developing a single application.

But I think the main differences you'll find, irrespective of scale, are a powerful designer/storyboard tool, Visual Studio integration, and the kind of support you'd expect to find from a paid product.