I actually like the first one. The second 2 are pretty meh. Thing is I would rather departments be different and have some form of self identity then plan ass black and white, all black or all white.
Police cars should be eye catching their job is to be visible. Presence patrols mean absolutely nothing if people don't see or notice you which is the first part of proactive policing. Ghost cars are great for the second part. Catching the people watching for the visible cars only. Without the first the second isn't going to be nearly as effective.
The second part of this is the reason most cars are going the route of the FHP cruiser is to increase visibility from nearly all angles. Its why everything is reflective. Its also why all Ambulance and Fire Trucks have to put those ugly ass chevrons on all their new equipment. Visibility ideally increases surviving the roads.
Now with all that said the Chicago Pattern is just as ugly as the previous one. The only reason to have the Unit Number so plainly visible is for the increase in recordings. Its CYA for the department to crucify their guys if they fuck up.