I've got a Provari and a few mods I've built with the DNA 20. The DNA 20 has some convenience features over the Provari but in the end they both vape the same, that is unless you want to go above 15w, the Provari won't do it but I use my Genesis on it all the time and it's got plenty of power to satisfy me. VW doesn't mean much to me, as long as it's variable adjust to where you want, vape and forget about it.
If the Provari is out of your price range then the DNA will probably be way out of it. I haven't seen a production mod yet with the DNA-20 besides the Vapor Shark near the Provari price point.
I say go with the Provari, nothing beats it for durability, consistency and customer service.