The current run of cartomizers with the heating coil at the top have given me the most satisfying vape so far, a little warmer and more flavorful that attys I have used. They are also very easy to clean the coil (dry-burns), since you can see your progress. I also like the clear-o-mizers, so I can see how much juice I have. Unfortunately, the clears don't travel well in my pocket, and will crack and leak sooner or later. By contrast, the Ego tank system (uses an atty) is more durable and realiable, but I don't get as good a vape out of it....and, you can't see the coil (even with the wick/piercing plate removed), so cleaning is an act of faith.
Most of all, have spares on hand of whatever you decide you like, nothing worse than finding no way to vape in the middle of the day ;-p