The dimmer Powermodul series may be 200% more but it's just lighting alone. As for the IKS and Aquatronica, it's not juz the function but oso the price that is the main decision factor.
If I'm not wrong, the module for the Aquatroinca is plug-n-play. Meaning to say, once configured, you can plug and unplug the module without the need to ensure that u plug back to the same port . Not sure abt IKS! Maybe someone can verify on that!