Re: Anker chargers, a few perform pretty well but many are kind of middling. A friend has been doing a lot of reviews of these on Youtube (https://www.youtube.com/c/AllThingsOnePlace) and we started compiling test data- focusing on power conversion metrics such as efficiency and power factor, summarized into a single "power quality score" on a 0-200 scale- in a database at https://pqs.app.
Do you test for protocol negotiation for USB C Power Delivery and proper Lightning or Thunderbolt support? I think for many uses that's more important than small electrical losses
We haven't done lightning/thunderbolt, but the Youtube reviews include the different USB-C power modes. We also look at some aspects of safety, such as when overcurrent protection in kicks in relative to the device rating, and if it automatically resets after tripping or requires power cycling.