Good Morning, I need some input from the SharePoint community. After several years of evangelizing, I am finally getting some divisions that would like to setup shop in SharePoint. I am trying to decide on Site Collection vs. Sub-Site. They would like to keep Management, Administration, and Supervisory data segregated with some overlap (see image).
My question to you is: should this be separate site collections, or should I use sub-sites and lock it down the further up the chain of command we get?