The set and forget of VW is good if you use the same juice in all your tanks. I use VV because I find that differant juices vape better at differant levels. The 3 ProTanks I have in rotation that have coils that ohm out at 2.5 and I adjust my voltage according to the juice. My B&M mix Smarties runs best at 4.2 V, but my Redbull runs better at 4.4 V. I'm always making adjustments as I vape so the important part is the "varible", whether it be voltage ot wattage.
Very good point.