IMHO, if you know how to use them properly and aren't spoiled by the superior taste of atomizers, cartomizer tanks can deliver a great vape with near no fuss portability. As long as you prime them and become experienced refilling them, they can last for weeks. I highly recommend that people try them if they haven't.
That being said, I've barely touched a cartomizer tank in the past month since I got my AMP Tank which I take with me everywhere. It's definitely fiddly, but the quality of the vape is well worth the trouble. It's definitely more hassle and leaky than cartomizer tanks.
I've also been using RBAs a bunch lately. The vape on a 1Ω coil is pretty incredible. Although the wick and coil is rock solid if using silica, it leaks out the air hole when tilted and requires regular refilling. Again, more hassle (relatively, at least the initial setup) and leaky than cartomizer tanks.
I have a bunch of IBtanked Pyrex tanks with cartomizers filled with juice. At least until I replace them with submersible rebuildable atomizers some day.
