Since your question seems to be primarily concerning cartomizer resistance, I'll answer that the best that I can. The ohm rating or resistance determines how hot the atomizer will heat your e-juice. Lower resistance means more energy applied to the atomizer, so more heat. More heat will often mean a hotter vapor, possibly more vapor production and throat hit.
Some people, myself included, prefer a "cooler" vape. Hotter vapor I find to be harsh on my throat and quite unpleasant. It can also make my juices taste burnt. Therefore, I prefer standard resistance atty's in my cartos. I use 2.0 ohm single coil cartos with my fixed voltage, mechanical mods. I use 3.0 ohm single coil cartos with my variable voltage Provari.
I've never understood how to explain dual cartos, other than there are two heating elements instead of one. Again, these allegedly provide more vapor and a warmer vape. I switched from dual coils to single coils because in my experience they provide a smoother
vaping experience and are not as demand heavy as dual coils on my batteries.
The difference in cartomizer brands seems to vary in the type of poly fill material. Boges are known to have more tightly packed polyfill, which frustrates me when filling them as the process is slow. Smoktek cartos are notorious for a looser packed filling, making them faster/easier to fill, but perhaps easier to flood also. There may be differences in the heating elements or the wiring, or the material that the heating coils themselves are wrapped in, but I have not torn each brand's cartos apart to study them.
I've found a happy medium in the Ikenvape Platinum cartos. I believe they are a 2.5 ohm single coil. The problem with them is their vendor's supply is often out of stock, so my backups are the Smokteks. I've only purchased Boges once, last summer when Bogegate was in its infancy and did not care for them so never bought more. They seem to be one of the more popular brands though.