tank: Fogger V4 (dual coil), Taifun GT2 (Single coil)
RDA: Derringer
That is the official answer, but not to say I don't use others more depending on the circumstances... Subtanks are grab and go fuss free versions, I save those for when I go out or on vacations. I have a Tugboat I use for testing juices since it provides great flavor.
Most hated atomizer: Squapes Both original and the R version leaked.. spent literally 20 hours rebuilding, working with o-rings, Trying cotton, silica, SS mesh, hemp, lot of cotton, little cotton, macro builds, micro builds,... you name it. Works great when I use it often, but at the end of the day, I set it down on the table, and in the morning, it's sitting in a puddle of ejuice.