Without consideration for wire gauge which affects vapour temp, the rest of the factors such as voltage/resistance/wattage will make you go in circles.
The lower the wire gauge, the lower resistance you can go while maintaining same temperature
30 awg is best all-rounder. Sub-ohms vapers normally use <=28awg. Its not feasible to use =>32awg for sub-ohm vaping due to overly high temperature which can give a burnt taste, which explains why some will never understand sub-ohm vaping.
Ref: Wire diameter vs wire temp/current drawn(P=VSq/R, V=IR) :
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You must always
first match wire gauge to your:
Setup
Voltage
1) Fixed Ego Battery
2) Fixed Mech mod with Types of Batteries used (current rating)
3) Variable voltage range (3V to up to 6V)
Resistance
1) sub-ohm
2) low ohm 1.0 to 1.7 ohms
3) Standard - 1.8 to 2.8 ohms
Non-standard Sub-ohm vaping with the right size of wire gauge/coil type can achieve similar vaping temperature with standard resistance range.
It offers the advantage of massive vapours/flavours but at price of much higher juice consumption and shorter battery life.
Coil Type
1) Normal spaced-out Coils
2) Micro/Nano Coils
3) Single vs double or more coils
4) Ribbon vs single/twisted strands
5) Other Coil shapes/positioning
Wick Type
1) Silica
2) SS Mesh
3) Cotton *
4) Others
* - Most satisfying to majority of vapers in terms of vapour/flavour.
Users Skillset
Novice vs Veterans.
If one has mastered the correct techniques to set up a coil/wick properly, the outcome is entirely different.
Rebuildable Atomizer Type
1) Top vs bottom coil tanks
2) Genesis vs Drip tanks
Juice Type
1) Types of Flavouring
2) VG/PG Ratio
3) Other chemicals added
Different e-juices might taste differently at cooler or warmer temperature.
To achieve:
Desirable Outcome
1) The most suitable temperature
2) Best flavour
3) highest amount of vapour.
Desired outcome is subjective and dependent on individual's preference and experience levels.