I love my full-sized Erlk. Waiting on a Nano from FT, which is a bit larger in diameter (22mm) then the original Erlk. I love the Lemo. It's just really big. Even on my Hana clone it feels big. The Erlkonigins are brilliant on the
istick. I vape max VG liquid. Both handle it very well.
The Erlkonigin Nano is cheaper, slimmer, shorter and has a larger capacity then the Lemo Drop: <$14, shipped vs <$40; 22mm vs 23mm; 56mm vs 74mm; 3+ml vs 2.7ml. The Erlkonigin is top-fill. You must disassemble the Lemo's bottom cap to fill it.
If you get the Erlk Nano clone and it's not airy enough for you, it is very easy to open up with a round needle file. My 1:1 Erlk clone is now as airy or airier than the Lemo. You must take the bottom of the Lemo apart to adjust the airflow.
Once mastered, I find the Erlk easier to build. My current Erlk coil has >100ml through it, having been wicked twice, and is still going strong.
You can separate the Erlk's base from the tank without draining (videos online). If you like a glass sleeve for the tank, hit up IBTanked for $5 or so.
Can you tell I love my 1:1 Erlkonigin clone and am anxiously awaiting the arrival of the Nano from China?