I don't think anybody really knows to be honest but if I was to bet money I'd bet on inhaling less vapor at lower temperature as being less harmful. I've read many scientific articles and studies the past couple of months and I'm yet to find one that specifically differentiates between different kinds of vaping.
There are many variable factors included with both types of vaping: Different pg/vg ratios, different types of flavorings and additives used in juices, different vaping styles and frequencies among vapers (like some go through 2ml liquid a day doing mtl, others do 10ml), even different types of nicotine used: freebase and 3 types of salts, as far as I know- do they differ in terms of health effects?
Also lack of valid scientific data. If you are very concerned about health, my best advice would be to do as much research as possible, and go with your gut.
Keep in mind you don't necessarily need to use high nic in pods all the time. If you gradually cut down you'll be fine with lower nic, there are folks out there who vape 0 nicotine or/and unflavored juices.
My gut tells me that the surface temperature of a coil is not homogenously spread, and that temperature control doesn't work because it only measures an averaged number that isn't very representative of all the various different temperatures that occur, e.g., the center of the coil generates the most heat so the cooling effect caused by airflow characteristics in cohort with evaporation (that's right, evaporation causes cooling, and a freezer uses evaporation of a liquid coolant exactly because of it...) and juice flow characteristics are among critical factors. So, meticulously tweaking these factors and all the other factors each one of which is part determining these factors, is the way to go, when the fast vapor production of high wattage vaping on complex coils that I can build myself by using a cordless drill and some swivels is what enables me to actually
FEEL, in the most direct sense of the word
FEEL, what goes on with temperature and with the localized buildup of heat, thereby allowing my brain to outweigh the pros and cons engendered by these differences and changes. My gut feels.
Bottom line: I prefer to use mech mods with powerful intricate coil builds that are specifically designed to help clear the path toward my tactile senses. After all, the tactile senses are important for identifying touch, pressure, pain, temperature and texture so, going with my gut is the equivalent to the
direct path only a mech is capable to provide, while at the same time also acknowledging the fact that the human ability to detect and accurately identify the aforementioned stimuli is linked logically to the intensity, or power so that's why
James Watt also plays an important part... despite I happen to be
HSP in such a particular way that I possess a magnified level of susceptibility to this specific type of stimuli I believe are at the core of the human species'
naturally developed ability to detect and identify harm,
intuitively, i.e., by going with your gut when being in absence of any additional data points.
Sensing harm.