I've recently tested Nude, VapersTek, Nicselect (NicRiver), and RTS. I also have Wizard Labs and MFS circa 2013-14 in the freezer. For the price, I found RTS the best overall nic. It's crystal clear with a pleasant flavor of it's own (I've been vaping unflavored quite a bit lately). I liked RTS so much I got 4 liters and am thinking about 2-3 more. Nude and VT are excellent as well but double the cost.
If you have the time I would order the smallest bottle possible from 3-4 vendors and test it unflavored. They each have their own flavor notes and throat hit differences. Just pick the one you personally like the best and buy as much as you can afford. It's the most important piece of the vaping hobby and there is no doubt in my mind that the days are numbered for free flowing high quality nic at cheap prices.
If you have the time I would order the smallest bottle possible from 3-4 vendors and test it unflavored. They each have their own flavor notes and throat hit differences. Just pick the one you personally like the best and buy as much as you can afford. It's the most important piece of the vaping hobby and there is no doubt in my mind that the days are numbered for free flowing high quality nic at cheap prices.