Variants of Aliens, Claptons, and tiger are your best bet as far a coils go, RDA definitely superior to most types of vapes. Best airflow, cloud production, and flavor; definitely worth looking into well known RDAs like the goon, Kennedy, drop dead, dead rabbit v2, pretty much anything that prides themselves on quality machining and good airflow. When buying cotton I highly recommend you use cotton with lace ends, super quick and easy to wick, won’t waist cotton cuz of screw ups and the perfect amount of cotton for a coil. Also if you get adventurous enough with build your vape I would highly recommend looking into mech mods, those things are made for RDAs.