Rebuildable tanks are designed with either a single or dual coil build deck. Most (but not all) dual coil RTAs are suitable for operation with either one or two coils, but assuming we have the choice - what factors might influence our choice?
Single vs Dual Summary
A dual coil deck will optionally allow a much larger coil heating surface area. Suitably utilised, this can significantly increase maximum useable Wattage, vapour production, extended useable Wattage range, and (if desired) dramatically increased toke potency while maintaining an deceptively smooth vapour and minumum of noise/spitting from the coils.
Many Dimitri explorers (including myself) find a single coil to perform perfectly adequately (my own benchmark is safely reaching L3 in a single toke). However, at the same time, the sheer effortless punch (endowed by doubling the coil area) can be both alluring and humbling.
A dual coil setup can be easily set up & used in ways which increase juice consumption to alarming levels. If you don't need the extra potency of a dual coil setup, then it might be preferable to go for a single.