Although I have a couple of iStick30s that I'm perfectly happy with... the Coolfire IV would be a better choice. I have 3 of those, and the quality of Innokin products so far surpasses that of eleaf, it's not funny. One of my CF4's survived about a 5-6ft violent drop onto the concrete driveway without any damage except a very small ding in the bottom edge, still works perfectly. Pretty sure that would have killed an iStick. Their prices are very similar, very close, so for the quality alone, I'd recommend the CF4.
Andria