For my birthday I got a humidifier and a dehumidifier...I put them in the same room and let them fight it out.
Classic. But which would actually win out? Enter science!
It would depend on the capacity (output) of each machine, but eventually the dehumidifier would win. Humidifiers need a water supply and eventually run dry. The dehumidifier just needs power to keep working.
Glad we got that solved. Now someone tell me what really happens when your apartment is infested with koala bears.