Well if you have a volt, then you have the best knock off available.
The original, best, the thing that volt is copying, is bloog max fussion.
single horizontal coil, no LR needed when paired with a good regulated bat (which a volt should be a pretty spot on match of the bloog).
So I would say either stick with volt, or switch over to bloog. They just reduced all of their prices too, since so many have been copying them at lower prices.
Just my 2cents though.
happy vapping!