However, as you say, the technology still needs to be perfected.
Juice delivery systems. This, to me, is where the biggest need for improvement is required in vaping devices. I like easy, and I like things to work out-of-the-box. Too many of these devices require some fiddling to make them work right.
I use mainly cartomizers in juice tanks. I like the convenience factor. The tanks hold the largest amount of juice, therefore providing the longest amount of time vaping between refills. I've also found, generally speaking, that cartomizers, whether uses alone or in a cartomizer-tank combination, give the fullest flavor of the juice. There is a learning curve involved in perfecting the juice delivery in a cartotank, needing to decide the number of holes required in the cartomizer depending upon the viscosity of the juice; whether to use pre-punched cartos or punch or slot your own, size of holes, etc. I do feel this system is rather primitive and archaic in its design and use of materials, and improvements can and will be made by manufacturers over time.
Clearomizers and ce3 devices should, in theory, provide the best flavor, as there is no polyfill in them to alter juice flavor like cartomizers have. However, I haven't exactly found this to be true in my own experience. Flavor in the ce3's seem slightly muted when vaped side by side with a cartomizer with the same juice and on the same type of battery. Perhaps this is due to the wicks not carrying flavor as well as the polyfill. I do love the ce3's the best for testing new flavors, though. Their smaller capacity is perfect for testing new flavors as only 1ml is needed for this. I also like that I don't have to dedicate a cartomizer for each flavor; a ce3 can be emptied, rinsed, and refilled with a new flavor relatively easily.
I don't drip directly on an atomizer. Just never got the hang of it; I either ended up with dry hits or flooding the sucker. The rebuildable atomizer tanks coming on the market for the big battery mods look like the right direction to take in perfecting the juice delivery system, however there also seems to be a large learning curve with these, and they require some hands on tinkering with making your own stainless steel wicks and coils. Too much fuss for me. They are extremely expensive, also.