From my research It's very much the materials you use when paired together. There will a sweet spot to be found with each 24,26,28 core then 32,34,36,38 outer
Since the outer is going to be heated by the core for the most part you need to ask yourself do I want the outer rapidly heating and cooling (higher gauge the better) or do I want a slower ramp up and slower cool down (thicker gauge). The aim is not to let the core do all of the work or you might as well not bother using claptons (so enough heat everywhere for surface area to heat juice to produce better clouds and flavour)
Bear this in mind OP, best bet is to search for wires and thier properties to understand whether they are suitable in power mode or temp mode also thier ramp up times...
Start with a gap of 10g between the inner and outer and see what suits you then Its a case of tweaking until your happy with it....also just because a coil set up tastes great in one RBA doesn't mean that is the right one for the next