More advanced? Guess it depends on your definition of advanced. I have never come across a part I couldn't do with the 3D paths. Esprit has 2 levels of 3D paths, Freeform and Mold. You def want the mold paths.
Ya, the old Esprit interface is dated but TNG has that Microsoft Office layout that pretty much everyone is transitioning to now. The buttons on a software package don't bother me much as long as the solids/verificaiton all are up to date.
As someone else brought up about workflow and automation/integration, if this is something you are considering, Esprit wins again. I think Esprit could be the only CAM software that has VBA. VBA is also standard in all of the Microsoft Office products, SolidWorks has it too....not that you couldn't use a 3rd software to do this integration, VBA is just easier.
I've said this many times, Esprit strong point, in my mind, is automation. You will be programming parts faster and you'll still have complete control over the toolpath.