I have about 6 different tank systems that I use, all of them are different except two, but one is an authentic and one is a clone, so can tell them apart. I just use a different flavor in each one so it is really easy to tell which one is which. Right now I have Virginia Extreme fired tobacco in the Aqua, Hynotic Mary in the Russian, Captain Blacks Cinfull Delight in the Authentic Flash-e-Vapor V2, Miss American Pie in the flashi Clone, and some Banana Nut Bread in the Nautilus. Use the Nimbus dripper for testing new recipes and for leisure, need to make a new build for the Terminator-C, but have Licorice in it currently.
When I look for a new tank I try to find something that will out vape what I currently own, which is hard to do now, and I like to get something different each time since every atomizer vapes a bit differently and gives one a different experience. I do have like 3 cheap clones, that although vape great, I have become dissatisfied with, because, well, they are poorly made copies and don't vape as well as the real deal.
My main criteria with tanks are that they are rba's, re-buildable atomizers, come with full Stainless steel tanks, like my tanks indestructible, lol, that their air is supplied through the side and not through the stem, hate atty's that can leak on top of the 510 connection, and they must be able to vape at 15 watts or higher, I have grown addicted to high watt vaping, and can barely tolerate vape at less than 12 watts. To me, the juiciness and flavor of my vape doesn't get fully developed till one breaks watt 13 or so. 15 watts is great, 30 watts is pretty darned tasty, then once you hit 50 watt capable atomizers, well words are not capable of describing.
Vape Trek, the final Frontier, these are the voyages of my vaping enterprise, a 5 year mission to explore strange new builds and mods, to seek out new ADV's and new mixed juices, to boldly vape, where I never have vaped before.