I have a rdna40 and snowwolf200w. I like that the snowwolf goes down to 0.05, at least for me it makes it easier to build nickel coils. 40watts wasnt enough to power a good nickel build in the dna for my taste. I use 0.2ohm prebuilt nickel coils in my snowwolf200w also with no issues. I just found it easier to build my own nickel coils for the snowwolf because of the ability to run down to 0.05ohms. Nothing wrong with the rdna40, love that mod too but now it is just my backup or when I want something more portable than the snowwolf200w.