For one thing, it didn't seem to matter what voltage I vaped at. I didn't ever notice an appreciable difference in taste or amount of vapor,
I'm glad I'm not the only one to found this to be true. So being able to change watts/volts did nothing for me.
On the other hand, I like the 'consistency' of having a constant voltage to be helpful. I can taste a difference when my egos are almost out of oomph. But I only have a couple vv devices because, IMHO, most of them are ugly.
Edited to add: I do have a couple of mechs and drippers but I don't use them. They're just in case the FDA decides to go absolutely nuts. (I also have a stockpile of juice.