I prefer the Ehpro Kayfun Lite V2 for myself and hubby, although the Hcigar Kayfun 3.1 seems to have better airflow. I don't generally sub ohm with my Kayfuns though, so I don't mind the airflow of the Lite versions. Some of course, prefer an airier draw regardless, and in that case I'd recommend the 3.1 or the Russian if they don't mind the price of the Russian.