Hi
A full broadcast is thicker and more damage resistant since the flecks 'overlay' each other and create a thicker profile. Plus because of the millions of little overlapping gaps that are created by the full broadcast of flecks at least two coats of clear coat are required so all of this makes the floor probably twice as thick as a standard epoxy floor with medium/heavy flecks that allow the epoxy to be exposed even partially.
While we would love to sell a full broadcast floor since they cost more, the honest answer is that for parking show cars a medium broadcast floor with topcoat is well more than adequate and should be perfectly fine.