A almost simple answer, wattage is how we read the heat output of the coil, the higher the ohm the higher the volt you need.
For example In volt mode! Not accurate just an example
With a 1.8ohm you need to set the volts to 3.7v to get a 8w output
With a 2.8ohm you need to set the volts 4.5v to get the same 8w output
In Voltage mode you need to re-adjust your voltage every time you change tank with a diferent ohm reading..
In wattage,
You setup your device to 8watts lets say, no matter what resistance ohm you put the vamo will read it and adjust your voltage automatically to get tha same 8w output no matter what ohm reading is in the coil
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So If I choose 7.5w and have a 2.6 Ohm resistance the vamo will automatically select the correct voltage?