Just think of it like this -
VV will set the voltage and that's what you're vaping at, simple as that.
VW the device will measure the resistance of the atomizer and then change the
voltage to reach the desired
wattage.
Really they'll both work just fine for you. Switching from a spinner it might feel easier to use the VV at first, but as you progress a lot of the higher end regulated devices (such as DNA-30, IPv2, etc.) use mainly VW... So it's worth using the wattage mode to get used to

Plus theoretically all tanks vape the same or very similar given the same wattage. (Granted, there are other factors such as airflow coil size coil type wick type etc., but yeah).
Enjoy the MVP, great little mod, had one myself before I switched to RDA's & mechs ^_^