I mixed at 2.5% on both to give me a baseline. (Edited post since that was info I intended to post and somehow forgot.)
Both flavorings had the same consistancy and were obviously alcohol based. They even had the same color when compared in the same vessel, the tip of the syringe, but look different through the two different bottles.
The VZ's scent was more floral while Ecig's scent was more earthy when smelled from the bottles. Once mixed, I could not tell the difference between the two by smell alone. Both had that perfume/Everclear smell before mixing.
Without a good steep, I wouldn't be inclined to use either as a standalone. The flavor does not have a real depth that I expect of my mixes. They will have to steep before I can make a real determination if this holds true.
I do not get the impression that they need to breathe like when I use mint oils and PGA to make a mix, but, it is still early. Real early for a tobacco flavor.
I have a number of other experiments I need to make a final determination about so I can free up more of my small glass bottles that I usually use for these kinds of things. All told I have over 30 new flavorings that need experiments started between the 2 vendors.