It really does depend on your setup. As a test I got a
kayfun loaded with a tasty 11mg
juice, at 1.4 Ohms. I'm gonna put it on 3 devices in turn, an SVD, a Semovar and a Nemesis. I'm not going to mess with the coil or the
eliquid, just move the Kayfun between devices
The Innokin SVD, if I go above 6.5W I get a hint of a burnt taste. I assume that's because the thing uses PWM, which is basically pulsing the coil on and off at full power, many times a second.
The Semovar provides a close-to DC output, which let me push up to 11-12W without burning. But too harsh for me. I stick to around 7-8W on that device.
My mech setup (Nemesis) runs at 12W (Ohms law on a fully charged battery), and it's a wonderful vape.
I've really no idea why I doin't find it too harsh, when the Semo gives a flat output. Maybe it's because I have a choice on the Semovar, and with the Nemmy I just have to take it easier, IDK. But as a progression between devices, this eliquid tastes rank on the SVD, nice on the Semo and amazing on the Nemesis.