The Kayfun type are flavor beasts, not the best for vapor. Genisis tanks are great but any other than the RSST require technique, skill and practice to get working right and consistently. You can also get dual coil Genisis setups. There are a bunch of other tank attys but none of them stand out for me right now as vapor winners.
Drippers don't have tanks but that also means they don't have to draw juice from a tank. That's an advantage for keeping the coils wet, but it means dripping regularly.
Suggest you pick one of the above, try it out, learn how to make it tick and see what works best for you. Battery safety is important or you will be venting batteries and that can get dangerous.