If you adjust to whatever tastes the best to you....watts or volts are just two different methods of getting to the same place....
WRONG.
Watts gives you finer control. Volts is very clumsy and not very accurate in comparison. If you adjust by wattage then you can make changes as small as 0.03 volts, which you cannot do by adjusting voltage.
In otherwords, wattage can take you places that voltage cannot reach.
For example:
Let's say you and I are running the same 1.5ohm coil. Now, let's say that the "perfect" operating setting for this coil is 8 watts.
If you're setting by wattage then you simply set 8 watts.
If you're setting by voltage then it cannot be done. 3.4 volts will give you 7.7 watts and 3.5 volts will give you 8.166 watts. If you're adjusting by voltage you have no way of running the coil at 7.8, 7.9, 8.0 or 8.1 watts. You lose 4 possible settings because you're adjusting by voltage.
If you only use one type topper watts will work well, if you use a variety of BCC, Gennys, RDA, cartos, attys then volts make it a bit easier...
This is even more wrong than your first claim.
If you want to run a 1.1 ohm coil, a 1.5 ohm coil, and a 2 ohm coil all at 8 watts then you set the wattage to 8 watts and forget about it.
If you are adjusting by voltage then you'll have to change the voltage for each coil. If you leave the voltage set for the 1.5 ohm coil then the 1.1 ohm coil will be burning your juices and your 2 ohm coil won't run hot enough for good vapor production.
Which is easier? One setting that works with every topper and coil you can throw at it, or having to change your settings with every new topper and coil?