1 Google Certification
ATV Android TV boxes have Google Certification(some of them also have Netflix certification), while AOSP and iATV Android TV boxes do not have any certifications.
The interface of ATV and iATV Android TV boxes is similar, it’s the regular ATV interface. However, AOSP Android TV boxes have many different interfaces, most of which are different from each other.
3 Remote Control
ATV system and iATV system Android TV box remote control is generally a Bluetooth wireless remote control, AOSP system Android TV box remote control is mostly infrared remote control（some of them with a 2.4G wireless remote）, compared with the Bluetooth remote control is more convenient to control. At the same time, it have more functions, such as voice control, gyroscope, etc., The infrared remote control can only be the most basic remote control.
4 APP Download
ATV system Android TV box can only download the APP in Google Play Store, other third-party APP can’t be downloaded casually, you need to authorize the third-party software “Download” to download them. AOSP and iATV system Android TV box can directly download third-party APP through the google chrome.
ATV and iATV system Android TV boxes don’t have ROOT, most AOSP system Android TV boxes have ROOT.
ATV system Android TV box needs to be certified, in the same function parameters, such as the same chipset, Android version and memory, etc. ATV system Android TV box will be more expensive than AOSP system and iATV system Android TV box.