What do the different law enforcement vehicles mean?

Police officers and sheriff deputies who drive marked vehicles are always in uniform and perform traffic enforcement. They are the public's first contact after calling 911 unless a tactical unit goes in first, such as arresting someone on a door bust-down at 5am.
Supervisors and detectives in civilian clothes drive unmarked sedans. Their cars are a dead give-away with their blackwall tires and spotlight. The Ford Crown Victoria's say Police Interceptor on the trunk lid.
The military looking vehicles are for tactical purposes, and are usually a gift from the federal government. This has created negative blowback from the militarization of local police forces.

First in best dressed 🤣

Unless the name of the department on the door/side of the car is different it just means they bought a different vehicle, either it was cheaper, better gas mileage/better performance, it has 4 wheel/all wheel drive for different climates like snow/ice or they're just trying out a new type of vehicle. Sometimes the SUV type can carry more equipment or such but the type of car doesn't mean much.

It could two different towns..
Or state police...
The state police here mostly use grey SUV's..
Local police use black or blue ..