As alcarl stated, much will depend upon your personal preferences. We are fortunate to have multiple choices in tank delivery devices, and it will be up to you to decide which best suits your personal expectations by trying different types out on your own battery device setup.
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A fixed or single voltage battery device might need to have a variety of different resistances of delivery devices to adjust the vape. As stated, lower resistance will provide a warmer vape, but some vapors will find it to be too harsh or to burn some fragile flavors. A standard or higher resistance will provide a cooler vape, which I prefer. I don't need to replicate the heat of an analog to enjoy my vape. I find the cooler vape to be smoother and to allow for more flavor production. Other vapors' experience will be different from mine, thus a period of experimentation is in store for you to decide which you prefer.
Variable voltage/variable wattage battery devices in general benefit from using a higher resistance of at least 3.o ohm to take best advantage of their capability, as seen in the below chart. Being able to adjust your battery device's voltage to each flavor that you use is a huge advantage in enjoying your vaping experience in my opinion. Each flavor may have it's own "sweet spot" in voltage.
Guide to Safe Vaping - E-Cigarette Safety | Ecig Advanced Community Blog
I put priority on flavor production, not so much on throat hit or vapor production. In my own experience, I have found cartotanks to provide better flavor production than clearotanks. I've never cared for clearomizers or top coiled clearotanks. The bottom coiled clearotanks allow for more flavor, but still not to the level of cartotanks. Again, this is based on my own experience.
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The resistance (ohms) used will greatly affect your vaping experience. Using too low resistance may cause juices to taste burnt. Dual coils might produce the same effect. Again, others will have a different experience.
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After using cartotanks almost exclusively for nearly a year, I have recently experimented with RBA's and bottom feed mods. Both seem to have the potential for better flavor. A drip atomizer has no filler or string wick to alter a juice's flavor, but this lack of wicking material means it can only use a few drops of juice at any time. This can be considered an inconvenience in most vaping situations, especially when mobile. It also requires carrying a bottle of juice with you.
A bottom feeder mod used with an atomizer offers the pure flavor of using a drip atomizer with the convenience of a tank. The mod has a built in juice tank. The user "squonks" or taps the juice bottle through a window in the mod to bring juice to a drip well where the atomizer is attached. The user sucks on the atomizer like a primer puff on a cartotank to bring juice to the atomizer and then vapes. Need more juice? Just perform another squonk and primer puff. Bottom feeder mods are available in both single and variable voltage.
RBA's offer the upper rung of delivery devices, but they must be considered to be more complicated with a higher learning curve than the other juice delivery devices. They require a certain level of expertise and knowledge and the user must be willing to "tinker" to perfect their device, as you are building your own wicks and coils. This is not for the "average vapor". Those wishing to get into the ultra low ohm vaping also need to especially understand battery and mod safety and know how to use a multimeter. I recommend a lot of research and self education prior to using an RBA for the first time.
