I've always tended to go for maximum watts without burnt hits with whatever regulated devices I was using. Typically 7 - 10 watts with typical
juice delivery devices at 1.8 to 3 ohms. That seemed to maximize flavor, TH and vapor for me.
Then I discovered mechanical mods and RBAs/RDAs and now I'm running about 16 watts, 0.8 ohms in single coil RBAs/RDAs and 26 watts, 0.5 ohms (two 1 ohm coils) in a dual coil Trident RDA.
I also make my own
juice so I can tailor it for the device, instead of the other way around. However I never go over 18% total flavoring and some of my juices have only 5%.