I'm still confused over the advantages of VW over VV?
None. They are the same thing. ... and I don't care who gets mad at me for saying that. It's true. Got a resistor you are hoping to produce heat with? Want more watts, you add more volts. Add more volts, you get more watts. And for whatever watts you want, you need to add the exact same volts to get it no matter if you started out wanting watts or you started out adding volts to get to the watts you want. They are the same exact thing.