Stackable Network VS Chassis Network

I’m looking for an easy way to visually explain how a chassis network
backbone solution compares to a stackable network backbone solution. I have
a budget meeting with my Board of Director who will ultimately decide if I
get a stackable switched solution or a chassis switch solution. I believe
the best way to show the superiority of a chassis system over a stackable
system is by diagramming it. The Board of Directors are not technical
people.

Any ideas would be appreciated