I find the cartomizer much easier. Some people prefer the taste of a atty/cart. I really don't notice enough difference and a carto holds much more juice and you have to fool with it less. I just fill up a few cartos and I'm good to go for the day.
I use the atty/carts to test flavors. In case I don't like the juice I don't want to waste a carto.
I use the atty/carts to test flavors. In case I don't like the juice I don't want to waste a carto.