I try to be as universal as possible when it comes to my 9 Guides, thus I use EC and my own EC System which fully works in III, VC, SA, LCS, VCS, IV, TLaD and TBoGT. For CW, it'd work if there are any EC Vehicles, though there is a EC Cruiser, which still needs to be confirmed. It's your choice if you want to use it for your own Guide or not.
This is how the EC System works: Visible OVER Invisible. The Player must know for sure if the Color is Visible or not. If it's invisible, then it's called EC2, if it's Visible, then it's EC. If people say UC2, you will need to ask them if the Color is Visible or not, same with UC1. (I say UC1 and UC2 if the Colors ALONE are Special.)
Secondly, the UC System has another huge Problem, whereas the EC System fixes it. III, VC, LCS, VCS, IV, TLaD, TBoGT, CW (?) and SA (only for Vehicles which can't be modded in Mod Shops) spawn vehicles in Set Pairs/Triples/Quadruples and Carcols.dat proves it. For example, in TLaD there are the two Unique/EC Reginas. They are not UC1, not UC2, not UC3, but it's EC. How come? The Combination of those Colors make the Vehicle EC. EC focuses on the Combination of Colors, meanwhile, UC says if ONE Color on ONE Color Area (Primary, Secondary etc.) is Special.
Where the EC System fails, but the UC System wins is in SA and V (ONLY for Vehicles which can be modded), as there different Colors can be combined in Mod Shops. Though, for stuff like this, I will say "Perennial with EC Black Roof" so the EC System says what is EC on the Vehicle which can be modded. I use that same thing in IV where the Secondary Color is Visible thus I say "with EC Door Interior" (for the Willard) or "with EC Rims" (for the Schafter and Sentinel) so the Player exactly knows what is going on.
In the EC System, if a Vehicle is EC2, then the Color is Special but Invisible. It makes stuff much more simpler for the Player.
Something I figured out just lately, I want to be strict with the Color Naming. I will say "EC Black AND Red" if the First Color is Black and Secondary is White, while the First and Second Colors are part of the Body Color (where the Secondary Color is not the Details, Rims, small things of the Vehicle). I will say "EC Black/Red" if the Red is a Luster and the Black is the Body Color, ONLY if the Luster is not Randomly Selected and if the Luster is Set AND Special in Combination with the Body Color. Thus I am very careful when it comes to naming Colors.
There were millions of suggestions before, like someone asked if UC and EC should be seperate in the SA Guide, where the EC Color should mean a Mod Shop Color and UC as a Color that can't be gotten from Mod Shops. I said no, as that would break the EC System... I want to have stuff MAKE SENSE and keep it SIMPLE, not to overcomplicate stuff.
The EC System may sound very complicated at first, but in the end it just makes stuff more simple and the Player will know what is going on. EC = Visible. EC2 = Invisible. That's all the Player has to know.
The UC and EC Systems remind me of Classical Mechanics vs Relativistic Mechanics... Classical Mechanics (UC System) is all fun and games until you get to very high speeds (until you get to the Color Combination Problem and if people have to ask you every time if the Color is Visible or not), thus then you'll have to learn that you need to make a whole new field of study for high speeds and have to take Relativistic Mechanics (EC System) into account...
Nice to hear that you'll do Videos for V Special Vehicles! Though honestly, Intros aren't needed. All you have to do is start to Record at the Pause Menu, then you load up your Save File and obtain the Special Vehicle, then you save, reload the Save File and show that the Vehicle is still there and then prove its Properties. No Edits, no Video Cuts, no Speed-ups, no nonsense. Just Raw Gameplay. If there is anything to explain, there's the Video Description, and if Viewers don't read it and lose a Special Vehicle, it's their fault for not reading the Description... This is how Lethal Vaccine makes Videos.