After my experience with Gothic 1 - 3 i can say i wish a seamless World, but it must not so big like G3. Several bigger Parts can be loaded in Game. This make place for a high detail Graphic, and a even scrolling World.
I think i like more Games with different Chapters, like G1. With a deep Story, and a good red line to follow, and the freedom to do everything i want. No hunting after the Storyline to bring the Game as soon as possible to an End.
A World wich is subdivide in diffenrent Parts with different level of difficulty. So that you cannot go in every Part as an beginner like in G3. And this is possibility to realize in an seamless World like Gothic 1.