The more I think about this question the more I realize that I am no position to answer it. There are too many variables and I do not have a professional background in network creation.

I wish you luck in your choice. Maybe another person here will be able to provide you with a better answer

here’s the physical topology.

Both a logical and physical topography are used to fit the mold of the situation. What type of physical topology do you have in place? What media do you have connecting these buildings? How far apart are the buildings? Is the main building geographically separated from one of all of the others?

Token based or shared, your decision should come after answering those questions.

I am sorry if I just muddied the water. Good luck.

This link may help you understand the basics, but it is a loaded question.