I have both and they are both brilliant. I think it depends on you and what you want learn, the modern piping has transferring stenciled designs onto a cake and then its pretty much all royal icing bar a few flowers and gum paste things, just painting the piped icing and planning the design (there is a lot of detail, i dont mean to make it sound like theres not much content because there is). The advanced fondant is all fondant like inlays and embossing etc (again more in it than I make it sound like). Both are great just different subjects.