No, just two issues that really matter.
1. Wasting electricity on the heating element-looking thing (wasting time talking about whether it is a heating element or a resistor), and
2. what controller is most efficient.
Heating up a coil might be a small amount of power in your mind, but do that all night long using a battery that is powering other things might just be enough to run the battery too low after a few cloudy days in a row. Run the battery too low and you got bigger problems than unrelated post.
It's all about the battery. Not everyone understands this. I know some people hop campground hook-up to campground hook-up, but others require everything from a battery set-up.
Instead of guessing, one day I might wire in an amp meter and actually measure the difference between High speed (no resistor), Medium and Low speed.
Eventually someone on forum will have already done this. I appreciate the guess on how much power the settings might use.