The main difference between WIFIPLUG HOME and WIFIPLUG POWER is that WIFIPLUG HOME is Apple® HomeKit™ enabled.
With Apple® HomeKit™ functionality comes new features not available to WIFIPLUG POWER such as Scenes. WIFIPLUG POWER has Group functionality but Scenes take Grouping devices to the next level.
WIFIPLUG HOME can also be used in the new Home app available to all iOS 10 users as well as the WIFIPLUG app available on compatible iOS and Android devices.
WIFIPLUG HOME and WIFIPLUG POWER are physically the same size.