Depends on how warm and powerful you want your vape.
I'm not one to do ohms law lol. But basically if you crank the twist up to 4.8 you will want to use the higher ohms head (2.4 and 3.2) If you live to vape at 3.7 volts the 1.8 head will do.
The beauty of the twist battery is that you can use any of the nova heads. The lower resistance 1.8ohm head will give you a warmer vape. lower resistance heads require fewer volts. The 2.4ohm heads work better generally around 4 volts.
On the nova, the head or atomizer is close to the mouth piece, so when you are taking a puff on the PV the vapor reaching your mouth is very warm. This helps simulate the feeling of smoking. In my opinion a 1.8ohm is too warm (for me). I prefer the 2.4ohm head.
IF you have a VV mod then you can go with the higher ohms ratings which means more turns in the coils and can deliver more vapor. But like the chart shows there are limits. Depends on the battery. If you go to low on the watts you don't get much vapor. To high and you burn the juice and get a pretty nasty taste and a good Throat hit. IME. Go to high and you can fry the atty. You may also exceed the limits of the battery. Depends on the type of mod you have.
If you need to make the calc yourself here is a spread sheet I made that will help. View attachment 148820
The limit is not a firm thing IMO it is diff between attys etc. IMO.
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