That is a very subjective question. I happen to be a big fan of ECOpure, which you can get from either innovapor.com or intellicig-usa.com. I'm just not much of an 'exotic' flavor kinda guy, nor do I like tobacco flavors. ECOpure's flavor is subtle and neutral. Its also VG based, which I like. I also believe its of the highest quality and purity and I found that my attys perform the best with it. I did, however, order a few flavors from Nhaler.com. All seemed to be very high quality
juice as well, Dr. Pepper being my favorite from there. Many of the folks here rave about their
juice. The next place I'll probably try is my freedomsmokes due to the good things I've heard about them and the ability to get high quantities of high nic juice that I can cut down, I like unflavored juice too. My 2¢.