OK, I've been vaping now for a couple months. I have figured out that VV is the only way to go, so now I have a provari. I have used regular cartos and LR cartos, dual and single coil. I am wondering what the consensus is, or the differences are? I guess that this device works well with any of them, so if you could use any atty's or cartos, what is your favorite and WHY? I am looking at buying an AVA atomizer, but they have a 3.8-4.0 version and a LR 1.8 version. Which would you buy?