For me - The Lemo set as stock fully open is still constricted compared to a Billow or Orchid. and much more compared to a Atlantis, but the flavor is great.
I can do Lung hits and get a nice rich dense Vape.
I prefer the Billow for it is much better than the Orchid for Air supply, and Flavor is almost as good as the Lemo.
Now Atlantis - at 35 watts fully open it is a nice Lung hit , but I find the Vape not too dense and a little dry, but for some flavors it is still fine.
I prefer not to compare Dripping to Tanking as they are a different beast.
I guess the Big dripper is as close to a RDA with self attached dripper, but I never like the Deck.
We're getting closer to better RTA's, so I can only imagine 2015 will bring some great products.
As long as demand keeps up, then there will be more companies investing in products that suit the Vaping Masses.
As more of the newer Vapers upgrade from the basic ego style devices, and go to a local B&M to test an RDA , and get that first "WOW" then tanks that give a similar experience will be the next creations.
I've only been vaping for a year and remember my first KFL, and thought this is it !
We've come a long way fast, and good things will be coming !