Drupps technology is different. It absorbs humidity from air by utilizing affinity forces in its liquid absorption matrix called FLOW. Absorption releases heat as well but that does not affect uptake efficiency as much.
Drupps technology can easily alter its uptake ability if necessary by altering FLOW concentration which is energy-neutral. The way dew point machines adapts is by altering temperature which is not very energy-neutral.
Dew point technology is focused around squeezing humidity out of air by cooling. When cooled, air cannot hold humidity. The colder it gets, the more water is squeezed out.
When liquefied to water, humidity releases vaporization heat. This heats the cooling surfaces, forcing the dew-point-machine to work harder to maintain the dew point temperature.
Weather is constantly shifting and it does not make sense to compare different technologies in one single climate point. This only makes sense if both machines are based on the same technology. Dew point machines tend to like 30*C/80%, a tropical condition where they look efficient.
An accurate comparison in AWG water cost needs to look at total cost (Capex + Opex + Maintenance) divided by total water produced over 365 days in a certain location.
Dew point machines are generally cheaper-per-nominal-capacity to buy than a Drupps Concept system. But Drupps Concept is significantly lower in energy consumption (Opex).
After a certain period, Drupps water cost will be lower than dew point systems. In most climate conditions, this period is approximately a few months. A 10-yr comparison normally results in a Drupps water cost of about 0.02-0.03 €/L, Dew point water cost at about 0.08-0.10 €/L.