The Aspire CF SubΩ Battery seems to be similar to a mechanical mod, but with the on/off feature. Meaning that you cannot adjust voltage/wattage or temperature settings. In that case, it is definitely up to you to figure out which resistance works best for you with any given
juice in the tank.
I don't normally use tanks on mech mods, but there is one exception. I have that tank (Gus Estia, Fatty Lord edition) dedicated to
vaping Ahlusion's Smooth Criminal juice and build its three coils to 0.7Ω.
I have the Atlantis V2, but I use it on a mod in temperature control mode. I also build my own Ni200 coils for it. Therefore, I'm not familiar with the factory coils that are available for it.
If you're not building your own coils, I suggest buying a sample of all the Kanthal coils they sell for that tank and find the setup that works best for you. You may find that different juices taste better with different coils.
Then, when (not if) you get a variable voltage/wattage/temperature system - or get into building your own coils - you'll find that many, many more doors open for you.
Although I really like the flavor and air flow options on the Atlantis V2, I think it is a HUGE tank considering its small juice capacity. Still, it does stay in my vape rotation.
TLDR: Find the coil that works best for YOU.
And WELCOME TO ECF!!!