I have a Provari and really like it, if I was to do it all over again, I'd probably start out with a future DNA20 mod, but since the DNA30 just came out, would wait for that to be used in some mods.
I love my Provari, I also love all my mechanical mods, and have just purchased The Beast Box VV mod, a no frills VV plastic box mod, that takes 2 26500 3000 mha imr batteries, has a 6 amp limit and can put out up to 50 watts and 8 volts. I just love all things vape.
The Provari is an excellent regulated mod, but don't know if it vapes better than a VTR, can accommodate more rba's easily than the VTR, know of some who have owned a Provari, but prefer the VTR. Once you get to a 15 watt capable device, the satisfaction and quality of the vape become more dependent on the quality and build of the atomizer, rba/rda, or carto tank, and the build then it does on the device used to power it. Thinking the VTR would give a better vape than the SVD, but probably comparable to the Provari. If I did have a VTR I would probably get a Tailfun GS rba for it. It is the only high end rba that I know of that would fit in the recessed 510 connection with out that gawd awful extension adaptor. Was the main reason I haven't purchased the VTR, like everything about it except the limitation of using some great rba's on it.
Don't think the Provari has anything over the VTR in the weapons performance category, am sure the VTR produces a much hard knock out hit than the Provari, since it is in the Extreme Heavy Weight Class of Mod Weapons of choice. lmao