I do not recommend these for a beginner.
The "BEST" of anything is what works for you to keep you from smoking. With that said I have over 100 different atomizers and there have been a couple improvements this year worth noting.
The EHPRO eTank F1
There are few true RDTAs. There are a lot of atomizers called Rebuildable Dripping Tank Atomizers (RDTAs) when in fact they are not. I have seen a lot of genisys and kayfun or coil cup style atomizers called RDTAs. They simply are not.
Here is a list of true RDTAs: Dolphin, Flash E many versions, Big Dripper & V2, Revel, 3D, eTank F1, Bullfighter, Skyfall.
I have them all and I must say the F1 is the one I prefer of them all out of the box. Instead of dual parallel coils you can build it with dual series coils and this makes a big difference. Still none of these are bottom airflow. Even the Revel which is a wonderful blue color is side airflow.
However, you can replace the base on the Revel with the Stillaire Mark IV, FT SKU 4575500, put a vape band around the revel where the side air holes are to block them, and you get a very good near bottom air flow RDTA that is actually superior to the eTank F1. But this is an example of a frankenstein or frankenatty. Note that I tried the base from a 22mm Kennedy and it was too big though I did get FT SKU 4892800 and a future project is to turn it down on a lathe or milling machine so it will fit. One could also use a cordless drill and a sharpening stone or sand paper with patience - chuck the base up in the drill using a screw through the 510 and nut on the bottom protecting the 510 threads. Then secure drill in a vise. Known as a poor mans lathe.
Unfortunates and what not to look for:
This year we saw a resurgence of genisys style atomizers somehow called "rdta" by China. This is misrepresentation at it's finest. The Fuji for example is a genisys when the liquid level gets below the deck. At best it is an RTA. The Limitless is clearly a genisys style. This thing fails at RDTA on two levels. First it is genisys style and second it uses side airflow just like the genisys. You can't even call this thing a bottom airflow genisys. At least the old 3D RDTA was truly an RDTA even if it was a side airflow. We have known for years that bottom airflow is far superior to side airflow. I have no idea why China keeps pushing side airflow atomizers.
All the information contained in these pages are only the opinions of the author and the author is not an expert at anything.