Are you OK with a Restricted Tablet?
Windows 8 RT, as it stands today will only allow software that you get from the Microsoft Store. Windows 8 RT is unlike any PC you've ever heard about. Are you OK with Microsoft being your sole source of all applications?
The apps have no limitations. It's only limitation is if Microsoft will allow it and if the authors will put up with Microsot.
8 Pro is more like your regular Windows PC. Open choices.