I have a Vamo V2 and two ProVaris. Neener²
<--- Ups the ante. I have a Vamo V3 and two Provaris. Neener
Ante's aside.
Both the Vamo and the Provari rock.
The Vamo is not very durable. My Vamo's finish is looking really mottled and it was nice looking chrome at one point, but now it's about to hit the garbage can, because it bothers me to hold the gritty. I'll buy the stainless V3 or maybe wait for the Stainless V4. Others have dropped their Vamo and it died, when it does you throw it away. Made in China. You can buy it on Fasttech for $36.31 for the Stainless Steel one.
The Provari is a tank. It is built solidly, and feels very substantial. It also vapes "smoother" to me. This may just be one of those things, like when you wash your car it seems to run better. It really doesn't run better but you enjoy it more because it looks better. Yes the Provari is a higher price. It is made in America with quality parts and comes with a nice warranty, in addition Provape is very good about repairs even after warranty. I purchased both of my Provari from Provape directly. One full retail, about $200 with my choice of LED and the extension for 18650 batteries. Second one I bought a blem for $133 on sale, then bought the second battery extender later. I can only use one at a time per se, but I do like having both set up and using two different flavors, one on each.
EXPENSIVE? What the hell are you smoking? I spent over $50 a week on cigarettes. My Provarii will last for years.
If Provape made a version with the OLED, and VW, I would be more than willing to pay the $20 each to upgrade my units to that version of the electronics for them.
Note that the Vamo is lacking in upgrade options, repair options and it's not very durable.
As far as vaping, there is not a lot of difference, both get the job done with the ability to change your voltage. You can change the wattage on the Vamo but that is NOT the end all be all it can be presented as. You memorize the voltages you like for the Ohms of your coil once you use the Provari about a week or so. I have 10 different types of tanks, they only have 3 different resistances. 1.8 Ohm 2.5 Ohm and 2.1 Ohm. 3.6V, 4.1V and 3.9V is where I vape those at. Sometimes a lighter juice needs lower voltage, sometimes a stronger thicker juice needs higher voltage. That happens with Wattage on the Vamo also.
In the end it's preference. If you can keep your Vamo alive for months, and aren't going to have an issue if it breaks, use the Vamo. The Provari isn't going to make your Vape different. It's merely the hardware. The part that will have significant impact on how your vape tastes and so forth is the top end device. The tank or rbda or genesis style atomizer and so on.
I have a $15 Omega, with a $8 Igo-L and a $2 drip tip that vapes very nicely. Would I recommend this to most? No, it's a real hassle to build coils for, can take over an hour at times to get that coil just right. It's not as safe either. The only major difference is that it blows HUGE clouds, which isn't what I need MOST of the time, but I have it so I can do that when I want to.
My Provari (either of them) and my Zen Z-Atty-Pro are what I use when I want the best flavor, but genesis type atomizers like the Z Atty Pro, are NOT pocket safe or friendly, they can and will leak, so don't put these in your pocket without a baggie or a prescription bottle to carry them in. I carry my Vamo V3 with a Protank or Protank II to school for the day. It can be placed in my backpack and if it gets stolen or breaks I won't burst a gasket. Sometimes I put a Lavatube v 1.5 in my backpack instead, it's lighter and has variable voltage also, and it's even more disposable to me than my Vamo is.
I use my Ego C-Twist to run to the grocery store, and as a backup.