If we're talking about function, they are probably on par, I've still got the Detech 18" just dont use it because of its weight, plus I'm not really into big coils..
If i had to rate my experience with 18" mono coils
NF 18"> coiltek 18"> commander 18"> then probably Dtech 18" > PulseMate Coils 18" DF
I've tried em all.. I only own the coiltek 18" currently, and it doesn't get out much.