There are lots of folks that disagree, but 12 watts is to hot for me from a KayFun. On the other hand 44 watts from my 0.4 ohm build in my Helios RDA tastes the same as 9 watts from the 1.25 ohm build in my Kayfun.
So watts only = volume of the vape
AFR (air fuel ratio) & coil temperature = taste