I have all 3 of the so called 'Big 3' sub ohm RTAs, Atlantis, Sub Tank Mini and the Delta 2. I love the flavor on the Delta 2, but I do not feel it is significantly better than the others, just a hair.
Maybe it is just me, but it so far the Delta 2 is only a tank I can use for evenings running wide open when I want more throat hit. It's a very hot vape for me. I run the Atlantis at 30-35w, no problem. The Sub tank mini, I like around 25-30, so it's not like I am 12 watt vaper. I can not seem to find a setting that works well on the Delta 2 though. Even low wattage, like 15 or so is hot, and is oversaturated when run at low wattage. It actually is smoother up around 45ish ripping the air as hard as I can. That is fine for once in a while but not an any time vape by any means. Makes me wonder what I am doing wrong because I do not see anyone really mentioning how warm/hot the vape is on it in the reviews out there.
I do notice that after the first dozen pulls or so it tends to level out and is not as strong/harsh/hot as when I first pick it up. I have been using the RDA deck with a 1.0ohm coil and KGD.