I've been experimenting with different ways to build coils. Lately I've been enjoying ~.6 ohms in my trident clone and I've gotten there several ways . . dual coils, singles with varying wraps/diameters, etc.
I was surprised but I find I prefer the vape experience in my trident with a single coil. Between a coil with wraps touching (in micro coil fashion) or not, I could not tell the different in flavor. I could tell the difference with twisted wire . .but I prefer non-twisted wire.
It's hard to describe the differences in flavor but, to me, the dual coils were underwhelming. The flavor and vapor production was good but not good enough to justify the extra work. I like a single coil just as much, if not better. The twisted wire kind of tasted sharp, if that makes any sense. The flavor was there but it was more on the hot-side but not burning . .if that makes any sense, lol. I do know that I really prefer a 3/4 wrap of 28 gage and it doesn't matter to me if the coils are touching or not.
That's only for this one rda, though. My preferences are totally different by device.