Too vague a question, Bjorhyn. If you generate some numbers in SE for both proposed setups, you should be able to answer your own question. ;-)
As the current for a dual parallel coil build is split, it MAY run cooler for a given wattage... but then, you'd not necessarily be using the same, gauge, wattage, resistance - or even wicking materials for both builds.
I have heavy gauge single builds that will consume juice at about the same rate as a thinner gauge dual build, at similar net resistances.
Good point!
I should rephrase that to say, "do you notice any difference in wicking efficiency, I.E. speed or capillary action, between single or dual coil builds?"
My assumption is no, as each wick is independent to each coil, but it really comes down to wicking method now that I give it more thought.
The most notable differences I can notice in my single v. dual coil sets is vapor production and juice consumption. Duals usually do more of both at the same ohms and wattage.
That being said, I really don't do many single builds, so I'm probably not a quotable source here.