Hi jamey. It's kind of a preference really. A lot of people here use a little of everything. My main stash is FlavourArt, but I have several TFA, CAPS, and a few INW flavors. I use them all, and they mingle well together.
You'll get lots of answers for nic. I like Vaperstek with throat hit. It's crystal clear, pretty much stays that way when stored properly, and the throat hit is pleasant, not throat punching like others I've tried. They also have one without throat hit, priced quite a bit more.