Carto with a tank, IMO is better than dripping, but close. Then again I think dripping on an ego with an ego is fairly frigid, even with the cone. Avoid, the chinese lavatube. There are plenty of good mods that are US made, better and around the same price. Plenty of people have had the LT's break on them already.
As far as tube mods go you have Variable Voltage options like the Buzz Pro and Infinity Pro from notcigs. You have the Provari as well. The VVV from kalamzoo vapor shop is 5V regulated, good idea. It works with about three different batteries at 3.7V and two different batteries at regulated 5V. You can use the DC cartos with those and a wider variety of atty that will be a warmer vape that the 3.2V or less with the Ego. The Silverbullet and other multi battery unregularted tube mods like the Bolt and such are all also good and durable. Good luck...