It's one of those discussions...
Drop-in coils vs rebuildable atomizers.
Flavour wise, depends on the product and the way the user builds them. Some designs since day one will never be good and that is a fact.
Price wise, rebuildables are way cheaper to maintain and are a type of product that ensures the user the capacity to build them over time due to availability of materials.
Ease of use wise, drop-in factory coils should in theory be easier but in reality some atomisers and this goes for all types are a pain to build, maintain and get a headache free consistant performance out of them.
In the end this is as a matter of preference and applicability of a certain product for a certain situation. Same discussion could go on for aios, pods, ext, ext.
What ever it takes to keep people away from combustion cigarettes.