vapor production, heat, flavor
depend on more on the wick and coil, and hows it made than the device it self...
Origen V2 RDA is an Rebuildable Dripping Atomizer. you put some e-liquid down the drip tip hole and the wick sits in a little juice well. they dont hold a lot of e-liquid and might leak if you tip them over.
Kayfun RTA is a Rebuildable Tank Atomizer. you fill up a tank and it feeds the wick and coil. they hold multiple mL of e-liquid. and are generally pretty leak proof