Aesthetics and non tangible factors (yay, made in the USA!) are important to the purchasing decision - no argument there. Strip all of that away and just look at performance and I maintain that there isn't a heck of a lot of difference. Tempted to do a "Pepsi Challenge" thing with some of my vaping buddies. Put on a blindfold, set the Provari and the Z at 4.5 volts and use the same carto tank. I would of course hold the device and push the button to eliminate giving anything away. Wonder how that kind of thing would turn out?
ON EDIT - a few hours after the original post. This drives me NUTS. Over the past week or so I have been testing this theory and have had both my Provari (lovely silver with blue LED) and my SS Z-Max charged and with me at my desk. I want to be able to make a definitive judgment (yes, I can be indecisive) so that one of these bad boys can be "the one"
I just can't seem to do it.
From a performance standpoint, I honestly cannot tell a difference. They both provide a rousing vape given equivalent carto tanks. The ProVari does feel "sturdier" (as in heavier). The Z is more comfortable in my hand and thinner. I like the feel of the button on the Z but I also like that the button on the ProVari glows a pretty blue. VW on the Z is a nice feature as I rotate tanks that have varying resistances in their respective cartomizers but ultimately, it's a "meh" - a few steps up or down on the ProVari and it's all the same.
Did I mention the pretty blue glowing fire button on the ProVari?
The net for me is that I wish that I could see a more definitive difference between the two overall. If I could, it would be easier to donate/sockdrawer/define as "backup" one or the other. But I cannot. Sometimes I prefer the ProVari, other times I prefer the Z based on the aesthetic factor alone. They both vape like little smokehouses.