1. the information about a polygonal shape such as the field encountered in Qix can be implemented: namely, as a circular list of nodes that correspond to vertices of the polygon

2. Another possible representation is to use a list of line segments that correspond to edges of the polygon.

ACTUAL QUESTION

Is there any benefit in adopting the second representation instead of the first one? Think, in particular, are there any of the operations required to implement the desired functionality that would be better served by the list-of-edges representation?