RTAs have a number of advantages over other kinds of tanks and atomizers.
Compared to sub ohm and MTL tanks with replaceable coils, the Best RTA will generally perform on a higher level when built right. It will also provide a much more tailor-made experience, while saving money on coil purchases. Wrapping coils offers a huge savings over purchasing them. An entire roll of wire can make a large number of coils at approximately the same cost as one or two factory made coil heads; the user is less likely to run out of wire at an inopportune time since a roll of wire may last months or years.
Similarly, a large package of organic cotton may last for more than a year. Moreover, the user of sub ohm tanks must rely on the manufacturer to continue providing coil heads for purchase, while the RTA user does not.
RTAs edge out RDAs in two departments. The first is e-liquid capacity. Users of RDAs must continually drip more juice into their atomizer while an RTA with large capacity may provide vaping enjoyment all day long before needing to be refilled. The second merit of RTAs over RDAs is that most do not leak if they are not kept upright. The way juice flow takes place on RTAs and the use of a chimney makes them less likely to leak if left at their side or even upside-down.
Compared to RDTAs, the main advantage of RTAs is size, closely followed by ease of wicking. Most RDTAs are much larger atomizers, while RTAs are generally more compact. Though RDTAs can be more challenging to wick properly, many of the newer products have been designed to alleviate most of these issues.