I break it into this equation
Flavor Monster - Reduced chamber and deck, reduced air flow atty, higher resistance dual or triple coil (0.5 to 1.2ohm), 1.5mm to 2.5mm depending how the atty deck and chamber allows, the thinner wicking will keep up quite nicely with this build
Cloud Monster - Wide chamber and deck, high airflow atty, lower resistance dual or quad coil (between 0.25 and 0.5ohm), 2.5mm or larger diameter, this allows super fast wicking and flow, more juice atomized, enough airflow to keep everything cool as possible gives the best cloud performance.